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Routing ports between VPN and world, eth0,eth1 tun0


iptables NAT/Forwarding with external ADSL router; PCs on the network can't access the internetAllowing SSH on a server with an active OpenVPN clientConnect AWS and Azure via OpenVPNNetwork behind OpenVPN clientOpenVPN Access Server: Remote Subnet Cannot Access Client's ResourcesHow to get OpenVPN Client (Mikrotik RouterOS) <-> OpenVPN server (Debian/Linux) setup to workUFW blocks permitted portsubuntu allow local ip address to connect to other local machine using sshopenvpn: can't manage to control client-to-client connections with iptablesLinux: Bridging two ethernet connections together to allow second host onto first network













0















VPN client with static address 10.8.0.2 exposes ports 80 and 5000. I need to forward ports 80 and 5000 on server from NICs to the client, so i can access "forwarded" ports from outside of the VPN network.



I've setup a 18.04 server for this, added second NIC, added basic configs (below), but VPN port forwarding does not work. NICs only respond for ICMP requests (ping works for both IPs) from outside, but it is not usable to connect to my ports.



The setup does not work as expected - VPN port forwarding is not working at all.





  • telnet can't connect to this ports from outside (NIC1 IP = timeout, NIC2 IP = connection refused)

  • ping from outside for both NICs works

  • i've tried the tutorial Bridging and Routing from Openvpn and its iptables samples, none seem to work

  • from inside the server, i can ping -I <dev> 8.8.8.8 both with ens5 and ens6


Firewall



sysctl net.ipv4.ip_forward is set to 1.



/etc/ufw/before.rules



#

# rules.before

#

# Rules that should be run before the ufw command line added rules. Custom

# rules should be added to one of these chains:

#   ufw-before-input

#   ufw-before-output

#   ufw-before-forward

#



# START OPENVPN RULES

*nat

:POSTROUTING ACCEPT [0:0] 



-A PREROUTING -i ens5 -p tcp --dport 80 -j DNAT --to-destination 10.8.0.2



-A PREROUTING -i ens6 -p tcp --dport 5000 -j DNAT --to-destination 10.8.0.2



-A POSTROUTING -s 10.8.0.1/24 -o tun0 -j MASQUERADE



COMMIT



# END OPENVPN RULES



# Don't delete these required lines, otherwise there will be errors

*filter

:ufw-before-input - [0:0]

:ufw-before-output - [0:0]

:ufw-before-forward - [0:0]

:ufw-not-local - [0:0]

# End required lines



# allow all on loopback

-A ufw-before-input -i lo -j ACCEPT

-A ufw-before-output -o lo -j ACCEPT



# quickly process packets for which we already have a connection

-A ufw-before-input -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT

-A ufw-before-output -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT

-A ufw-before-forward -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT



# drop INVALID packets (logs these in loglevel medium and higher)

-A ufw-before-input -m conntrack --ctstate INVALID -j ufw-logging-deny

-A ufw-before-input -m conntrack --ctstate INVALID -j DROP



# ok icmp codes for INPUT

-A ufw-before-input -p icmp --icmp-type destination-unreachable -j ACCEPT

-A ufw-before-input -p icmp --icmp-type source-quench -j ACCEPT

-A ufw-before-input -p icmp --icmp-type time-exceeded -j ACCEPT

-A ufw-before-input -p icmp --icmp-type parameter-problem -j ACCEPT

-A ufw-before-input -p icmp --icmp-type echo-request -j ACCEPT



# ok icmp code for FORWARD

-A ufw-before-forward -p icmp --icmp-type destination-unreachable -j ACCEPT

-A ufw-before-forward -p icmp --icmp-type source-quench -j ACCEPT

-A ufw-before-forward -p icmp --icmp-type time-exceeded -j ACCEPT

-A ufw-before-forward -p icmp --icmp-type parameter-problem -j ACCEPT

-A ufw-before-forward -p icmp --icmp-type echo-request -j ACCEPT



# allow dhcp client to work

-A ufw-before-input -p udp --sport 67 --dport 68 -j ACCEPT



#

# ufw-not-local

#

-A ufw-before-input -j ufw-not-local



# if LOCAL, RETURN

-A ufw-not-local -m addrtype --dst-type LOCAL -j RETURN



# if MULTICAST, RETURN

-A ufw-not-local -m addrtype --dst-type MULTICAST -j RETURN



# if BROADCAST, RETURN

-A ufw-not-local -m addrtype --dst-type BROADCAST -j RETURN



# all other non-local packets are dropped

-A ufw-not-local -m limit --limit 3/min --limit-burst 10 -j ufw-logging-deny

-A ufw-not-local -j DROP



# allow MULTICAST mDNS for service discovery (be sure the MULTICAST line above

# is uncommented)

-A ufw-before-input -p udp -d 224.0.0.251 --dport 5353 -j ACCEPT



# allow MULTICAST UPnP for service discovery (be sure the MULTICAST line above

# is uncommented)

-A ufw-before-input -p udp -d 239.255.255.250 --dport 1900 -j ACCEPT



# don't delete the 'COMMIT' line or these rules won't be processed

COMMIT


UFW status verbose



Status: active

Logging: on (low)

Default: deny (incoming), allow (outgoing), allow (routed)

New profiles: skip



To                         Action      From

--                         ------      ----

22/tcp                     ALLOW IN    Anywhere             

1194/udp                   ALLOW IN    Anywhere                                      

80/tcp                     ALLOW IN    Anywhere                               

5000/tcp                   ALLOW IN    Anywhere                                 

Anywhere                   ALLOW IN    80/tcp                    

Anywhere on tun0           ALLOW IN    Anywhere                  

22/tcp (v6)                ALLOW IN    Anywhere (v6)          

80/tcp (v6)                ALLOW IN    Anywhere (v6)                          

5000/tcp (v6)              ALLOW IN    Anywhere (v6)                         

Anywhere (v6)              ALLOW IN    80/tcp (v6)               

Anywhere (v6) on tun0      ALLOW IN    Anywhere (v6)             



Anywhere                   ALLOW OUT   Anywhere on tun0          

80/tcp                     ALLOW OUT   Anywhere on eth0                  

10.8.0.0/24                ALLOW OUT   Anywhere on ens5          

Anywhere                   ALLOW OUT   Anywhere on ens5          

Anywhere (v6)              ALLOW OUT   Anywhere (v6) on tun0     

80/tcp (v6)                ALLOW OUT   Anywhere (v6) on eth0       

Anywhere (v6)              ALLOW OUT   Anywhere (v6) on ens5


Interfaces



ip a



1: lo: 

2: ens5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc mq state UP group default qlen 1000

    link/ether aa:aa:aa:aa:aa:aa brd ff:ff:ff:ff:ff:ff

    inet 172.31.39.1/20 brd 172.31.47.255 scope global dynamic ens5

       valid_lft 2694sec preferred_lft 2694sec

3: ens6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000

    link/ether bb:bb:bb:bb:bb:bb brd ff:ff:ff:ff:ff:ff

    inet 172.31.39.237/20 brd 172.31.47.255 scope global ens6

       valid_lft forever preferred_lft forever

4: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 100

    link/none 

    inet 10.8.0.1/24 brd 10.8.0.255 scope global tun0

       valid_lft forever preferred_lft forever


/etc/netplan/50-cloud-init.yaml



network:

    version: 2

    ethernets:

        ens5: # NIC 1 = 172.31.39.1

            dhcp4: true

            match:

                macaddress: aa:aa:aa:aa:aa:aa

            set-name: ens5


/etc/netplan/51-ens6.yaml



network:

  version: 2

  renderer: networkd

  ethernets:

    ens6: # NIC 2 = 172.31.39.237

      match:

        macaddress: bb:bb:bb:bb:bb:bb

      dhcp4: no

      addresses: [172.31.39.237/20]

      routes:

       - to: 0.0.0.0/0

         via: 172.31.32.1

         table: 1000

       - to: 172.31.39.1

         via: 0.0.0.0

         scope: link

         table: 1000

      routing-policy:

        - from: 172.31.39.237

          table: 1000


ip rule list



0:  from all lookup local 

0:  from 172.31.39.237 lookup 1000 

32766:  from all lookup main 

32767:  from all lookup default


Routing



route -n



Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

0.0.0.0         172.31.32.1     0.0.0.0         UG    100    0        0 ens5

10.8.0.0        0.0.0.0         255.255.255.0   U     0      0        0 tun0

172.31.32.0     0.0.0.0         255.255.240.0   U     0      0        0 ens6

172.31.32.0     0.0.0.0         255.255.240.0   U     0      0        0 ens5

172.31.32.1     0.0.0.0         255.255.255.255 UH    100    0        0 ens5


ip route show table all



default via 172.31.32.1 dev ens6 table 1000 proto static 

172.31.39.1 dev ens6 table 1000 proto static scope link 

default via 172.31.32.1 dev ens5 proto dhcp src 172.31.39.1 metric 100 

10.8.0.0/24 dev tun0 proto kernel scope link src 10.8.0.1 

172.31.32.0/20 dev ens6 proto kernel scope link src 172.31.39.237 

172.31.32.0/20 dev ens5 proto kernel scope link src 172.31.39.1 

172.31.32.1 dev ens5 proto dhcp scope link src 172.31.39.1 metric 100 

broadcast 10.8.0.0 dev tun0 table local proto kernel scope link src 10.8.0.1 

local 10.8.0.1 dev tun0 table local proto kernel scope host src 10.8.0.1 

broadcast 10.8.0.255 dev tun0 table local proto kernel scope link src 10.8.0.1 

broadcast 127.0.0.0 dev lo table local proto kernel scope link src 127.0.0.1 

local 127.0.0.0/8 dev lo table local proto kernel scope host src 127.0.0.1 

local 127.0.0.1 dev lo table local proto kernel scope host src 127.0.0.1 

broadcast 127.255.255.255 dev lo table local proto kernel scope link src 127.0.0.1 

broadcast 172.31.32.0 dev ens6 table local proto kernel scope link src 172.31.39.237 

broadcast 172.31.32.0 dev ens5 table local proto kernel scope link src 172.31.39.1 

local 172.31.39.1 dev ens5 table local proto kernel scope host src 172.31.39.1 

local 172.31.39.237 dev ens6 table local proto kernel scope host src 172.31.39.237 

broadcast 172.31.47.255 dev ens6 table local proto kernel scope link src 172.31.39.237 

broadcast 172.31.47.255 dev ens5 table local proto kernel scope link src 172.31.39.1 

local ::1 dev lo proto kernel metric 256 pref medium

fe80::/64 dev ens6 proto kernel metric 256 pref medium

fe80::/64 dev ens5 proto kernel metric 256 pref medium

fe80::/64 dev tun0 proto kernel metric 256 pref medium

local ::1 dev lo table local proto kernel metric 0 pref medium

local fe80::88f:a9ff:fe75:11f2 dev ens6 table local proto kernel metric 0 pref medium

local fe80::894:3dff:fe41:89b4 dev ens5 table local proto kernel metric 0 pref medium

local fe80::7507:4098:a74d:65f8 dev tun0 table local proto kernel metric 0 pref medium

ff00::/8 dev ens6 table local metric 256 pref medium

ff00::/8 dev ens5 table local metric 256 pref medium

ff00::/8 dev tun0 table local metric 256 pref medium


What am i missing?






ubuntu openvpn ufw ubuntu-18.04 netplan







share|improve this question





























    0















    VPN client with static address 10.8.0.2 exposes ports 80 and 5000. I need to forward ports 80 and 5000 on server from NICs to the client, so i can access "forwarded" ports from outside of the VPN network.



    I've setup a 18.04 server for this, added second NIC, added basic configs (below), but VPN port forwarding does not work. NICs only respond for ICMP requests (ping works for both IPs) from outside, but it is not usable to connect to my ports.



    The setup does not work as expected - VPN port forwarding is not working at all.





    • telnet can't connect to this ports from outside (NIC1 IP = timeout, NIC2 IP = connection refused)

    • ping from outside for both NICs works

    • i've tried the tutorial Bridging and Routing from Openvpn and its iptables samples, none seem to work

    • from inside the server, i can ping -I <dev> 8.8.8.8 both with ens5 and ens6


    Firewall



    sysctl net.ipv4.ip_forward is set to 1.



    /etc/ufw/before.rules



    #
    
# rules.before
    
#
    
# Rules that should be run before the ufw command line added rules. Custom
    
# rules should be added to one of these chains:
    
#   ufw-before-input
    
#   ufw-before-output
    
#   ufw-before-forward
    
#
    

    
# START OPENVPN RULES
    
*nat
    
:POSTROUTING ACCEPT [0:0] 
    

    
-A PREROUTING -i ens5 -p tcp --dport 80 -j DNAT --to-destination 10.8.0.2
    

    
-A PREROUTING -i ens6 -p tcp --dport 5000 -j DNAT --to-destination 10.8.0.2
    

    
-A POSTROUTING -s 10.8.0.1/24 -o tun0 -j MASQUERADE
    

    
COMMIT
    

    
# END OPENVPN RULES
    

    
# Don't delete these required lines, otherwise there will be errors
    
*filter
    
:ufw-before-input - [0:0]
    
:ufw-before-output - [0:0]
    
:ufw-before-forward - [0:0]
    
:ufw-not-local - [0:0]
    
# End required lines
    

    
# allow all on loopback
    
-A ufw-before-input -i lo -j ACCEPT
    
-A ufw-before-output -o lo -j ACCEPT
    

    
# quickly process packets for which we already have a connection
    
-A ufw-before-input -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
    
-A ufw-before-output -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
    
-A ufw-before-forward -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
    

    
# drop INVALID packets (logs these in loglevel medium and higher)
    
-A ufw-before-input -m conntrack --ctstate INVALID -j ufw-logging-deny
    
-A ufw-before-input -m conntrack --ctstate INVALID -j DROP
    

    
# ok icmp codes for INPUT
    
-A ufw-before-input -p icmp --icmp-type destination-unreachable -j ACCEPT
    
-A ufw-before-input -p icmp --icmp-type source-quench -j ACCEPT
    
-A ufw-before-input -p icmp --icmp-type time-exceeded -j ACCEPT
    
-A ufw-before-input -p icmp --icmp-type parameter-problem -j ACCEPT
    
-A ufw-before-input -p icmp --icmp-type echo-request -j ACCEPT
    

    
# ok icmp code for FORWARD
    
-A ufw-before-forward -p icmp --icmp-type destination-unreachable -j ACCEPT
    
-A ufw-before-forward -p icmp --icmp-type source-quench -j ACCEPT
    
-A ufw-before-forward -p icmp --icmp-type time-exceeded -j ACCEPT
    
-A ufw-before-forward -p icmp --icmp-type parameter-problem -j ACCEPT
    
-A ufw-before-forward -p icmp --icmp-type echo-request -j ACCEPT
    

    
# allow dhcp client to work
    
-A ufw-before-input -p udp --sport 67 --dport 68 -j ACCEPT
    

    
#
    
# ufw-not-local
    
#
    
-A ufw-before-input -j ufw-not-local
    

    
# if LOCAL, RETURN
    
-A ufw-not-local -m addrtype --dst-type LOCAL -j RETURN
    

    
# if MULTICAST, RETURN
    
-A ufw-not-local -m addrtype --dst-type MULTICAST -j RETURN
    

    
# if BROADCAST, RETURN
    
-A ufw-not-local -m addrtype --dst-type BROADCAST -j RETURN
    

    
# all other non-local packets are dropped
    
-A ufw-not-local -m limit --limit 3/min --limit-burst 10 -j ufw-logging-deny
    
-A ufw-not-local -j DROP
    

    
# allow MULTICAST mDNS for service discovery (be sure the MULTICAST line above
    
# is uncommented)
    
-A ufw-before-input -p udp -d 224.0.0.251 --dport 5353 -j ACCEPT
    

    
# allow MULTICAST UPnP for service discovery (be sure the MULTICAST line above
    
# is uncommented)
    
-A ufw-before-input -p udp -d 239.255.255.250 --dport 1900 -j ACCEPT
    

    
# don't delete the 'COMMIT' line or these rules won't be processed
    
COMMIT


    UFW status verbose



    Status: active
    
Logging: on (low)
    
Default: deny (incoming), allow (outgoing), allow (routed)
    
New profiles: skip
    

    
To                         Action      From
    
--                         ------      ----
    
22/tcp                     ALLOW IN    Anywhere             
    
1194/udp                   ALLOW IN    Anywhere                                      
    
80/tcp                     ALLOW IN    Anywhere                               
    
5000/tcp                   ALLOW IN    Anywhere                                 
    
Anywhere                   ALLOW IN    80/tcp                    
    
Anywhere on tun0           ALLOW IN    Anywhere                  
    
22/tcp (v6)                ALLOW IN    Anywhere (v6)          
    
80/tcp (v6)                ALLOW IN    Anywhere (v6)                          
    
5000/tcp (v6)              ALLOW IN    Anywhere (v6)                         
    
Anywhere (v6)              ALLOW IN    80/tcp (v6)               
    
Anywhere (v6) on tun0      ALLOW IN    Anywhere (v6)             
    

    
Anywhere                   ALLOW OUT   Anywhere on tun0          
    
80/tcp                     ALLOW OUT   Anywhere on eth0                  
    
10.8.0.0/24                ALLOW OUT   Anywhere on ens5          
    
Anywhere                   ALLOW OUT   Anywhere on ens5          
    
Anywhere (v6)              ALLOW OUT   Anywhere (v6) on tun0     
    
80/tcp (v6)                ALLOW OUT   Anywhere (v6) on eth0       
    
Anywhere (v6)              ALLOW OUT   Anywhere (v6) on ens5


    Interfaces



    ip a



    1: lo: 
    
2: ens5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc mq state UP group default qlen 1000
    
    link/ether aa:aa:aa:aa:aa:aa brd ff:ff:ff:ff:ff:ff
    
    inet 172.31.39.1/20 brd 172.31.47.255 scope global dynamic ens5
    
       valid_lft 2694sec preferred_lft 2694sec
    
3: ens6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    
    link/ether bb:bb:bb:bb:bb:bb brd ff:ff:ff:ff:ff:ff
    
    inet 172.31.39.237/20 brd 172.31.47.255 scope global ens6
    
       valid_lft forever preferred_lft forever
    
4: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 100
    
    link/none 
    
    inet 10.8.0.1/24 brd 10.8.0.255 scope global tun0
    
       valid_lft forever preferred_lft forever


    /etc/netplan/50-cloud-init.yaml



    network:
    
    version: 2
    
    ethernets:
    
        ens5: # NIC 1 = 172.31.39.1
    
            dhcp4: true
    
            match:
    
                macaddress: aa:aa:aa:aa:aa:aa
    
            set-name: ens5


    /etc/netplan/51-ens6.yaml



    network:
    
  version: 2
    
  renderer: networkd
    
  ethernets:
    
    ens6: # NIC 2 = 172.31.39.237
    
      match:
    
        macaddress: bb:bb:bb:bb:bb:bb
    
      dhcp4: no
    
      addresses: [172.31.39.237/20]
    
      routes:
    
       - to: 0.0.0.0/0
    
         via: 172.31.32.1
    
         table: 1000
    
       - to: 172.31.39.1
    
         via: 0.0.0.0
    
         scope: link
    
         table: 1000
    
      routing-policy:
    
        - from: 172.31.39.237
    
          table: 1000


    ip rule list



    0:  from all lookup local 
    
0:  from 172.31.39.237 lookup 1000 
    
32766:  from all lookup main 
    
32767:  from all lookup default


    Routing



    route -n



    Kernel IP routing table
    
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
    
0.0.0.0         172.31.32.1     0.0.0.0         UG    100    0        0 ens5
    
10.8.0.0        0.0.0.0         255.255.255.0   U     0      0        0 tun0
    
172.31.32.0     0.0.0.0         255.255.240.0   U     0      0        0 ens6
    
172.31.32.0     0.0.0.0         255.255.240.0   U     0      0        0 ens5
    
172.31.32.1     0.0.0.0         255.255.255.255 UH    100    0        0 ens5


    ip route show table all



    default via 172.31.32.1 dev ens6 table 1000 proto static 
    
172.31.39.1 dev ens6 table 1000 proto static scope link 
    
default via 172.31.32.1 dev ens5 proto dhcp src 172.31.39.1 metric 100 
    
10.8.0.0/24 dev tun0 proto kernel scope link src 10.8.0.1 
    
172.31.32.0/20 dev ens6 proto kernel scope link src 172.31.39.237 
    
172.31.32.0/20 dev ens5 proto kernel scope link src 172.31.39.1 
    
172.31.32.1 dev ens5 proto dhcp scope link src 172.31.39.1 metric 100 
    
broadcast 10.8.0.0 dev tun0 table local proto kernel scope link src 10.8.0.1 
    
local 10.8.0.1 dev tun0 table local proto kernel scope host src 10.8.0.1 
    
broadcast 10.8.0.255 dev tun0 table local proto kernel scope link src 10.8.0.1 
    
broadcast 127.0.0.0 dev lo table local proto kernel scope link src 127.0.0.1 
    
local 127.0.0.0/8 dev lo table local proto kernel scope host src 127.0.0.1 
    
local 127.0.0.1 dev lo table local proto kernel scope host src 127.0.0.1 
    
broadcast 127.255.255.255 dev lo table local proto kernel scope link src 127.0.0.1 
    
broadcast 172.31.32.0 dev ens6 table local proto kernel scope link src 172.31.39.237 
    
broadcast 172.31.32.0 dev ens5 table local proto kernel scope link src 172.31.39.1 
    
local 172.31.39.1 dev ens5 table local proto kernel scope host src 172.31.39.1 
    
local 172.31.39.237 dev ens6 table local proto kernel scope host src 172.31.39.237 
    
broadcast 172.31.47.255 dev ens6 table local proto kernel scope link src 172.31.39.237 
    
broadcast 172.31.47.255 dev ens5 table local proto kernel scope link src 172.31.39.1 
    
local ::1 dev lo proto kernel metric 256 pref medium
    
fe80::/64 dev ens6 proto kernel metric 256 pref medium
    
fe80::/64 dev ens5 proto kernel metric 256 pref medium
    
fe80::/64 dev tun0 proto kernel metric 256 pref medium
    
local ::1 dev lo table local proto kernel metric 0 pref medium
    
local fe80::88f:a9ff:fe75:11f2 dev ens6 table local proto kernel metric 0 pref medium
    
local fe80::894:3dff:fe41:89b4 dev ens5 table local proto kernel metric 0 pref medium
    
local fe80::7507:4098:a74d:65f8 dev tun0 table local proto kernel metric 0 pref medium
    
ff00::/8 dev ens6 table local metric 256 pref medium
    
ff00::/8 dev ens5 table local metric 256 pref medium
    
ff00::/8 dev tun0 table local metric 256 pref medium


    What am i missing?






    ubuntu openvpn ufw ubuntu-18.04 netplan







    share|improve this question



























      0












      0








      0








      VPN client with static address 10.8.0.2 exposes ports 80 and 5000. I need to forward ports 80 and 5000 on server from NICs to the client, so i can access "forwarded" ports from outside of the VPN network.



      I've setup a 18.04 server for this, added second NIC, added basic configs (below), but VPN port forwarding does not work. NICs only respond for ICMP requests (ping works for both IPs) from outside, but it is not usable to connect to my ports.



      The setup does not work as expected - VPN port forwarding is not working at all.





      • telnet can't connect to this ports from outside (NIC1 IP = timeout, NIC2 IP = connection refused)

      • ping from outside for both NICs works

      • i've tried the tutorial Bridging and Routing from Openvpn and its iptables samples, none seem to work

      • from inside the server, i can ping -I <dev> 8.8.8.8 both with ens5 and ens6


      Firewall



      sysctl net.ipv4.ip_forward is set to 1.



      /etc/ufw/before.rules



      #
      
# rules.before
      
#
      
# Rules that should be run before the ufw command line added rules. Custom
      
# rules should be added to one of these chains:
      
#   ufw-before-input
      
#   ufw-before-output
      
#   ufw-before-forward
      
#
      

      
# START OPENVPN RULES
      
*nat
      
:POSTROUTING ACCEPT [0:0] 
      

      
-A PREROUTING -i ens5 -p tcp --dport 80 -j DNAT --to-destination 10.8.0.2
      

      
-A PREROUTING -i ens6 -p tcp --dport 5000 -j DNAT --to-destination 10.8.0.2
      

      
-A POSTROUTING -s 10.8.0.1/24 -o tun0 -j MASQUERADE
      

      
COMMIT
      

      
# END OPENVPN RULES
      

      
# Don't delete these required lines, otherwise there will be errors
      
*filter
      
:ufw-before-input - [0:0]
      
:ufw-before-output - [0:0]
      
:ufw-before-forward - [0:0]
      
:ufw-not-local - [0:0]
      
# End required lines
      

      
# allow all on loopback
      
-A ufw-before-input -i lo -j ACCEPT
      
-A ufw-before-output -o lo -j ACCEPT
      

      
# quickly process packets for which we already have a connection
      
-A ufw-before-input -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
      
-A ufw-before-output -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
      
-A ufw-before-forward -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
      

      
# drop INVALID packets (logs these in loglevel medium and higher)
      
-A ufw-before-input -m conntrack --ctstate INVALID -j ufw-logging-deny
      
-A ufw-before-input -m conntrack --ctstate INVALID -j DROP
      

      
# ok icmp codes for INPUT
      
-A ufw-before-input -p icmp --icmp-type destination-unreachable -j ACCEPT
      
-A ufw-before-input -p icmp --icmp-type source-quench -j ACCEPT
      
-A ufw-before-input -p icmp --icmp-type time-exceeded -j ACCEPT
      
-A ufw-before-input -p icmp --icmp-type parameter-problem -j ACCEPT
      
-A ufw-before-input -p icmp --icmp-type echo-request -j ACCEPT
      

      
# ok icmp code for FORWARD
      
-A ufw-before-forward -p icmp --icmp-type destination-unreachable -j ACCEPT
      
-A ufw-before-forward -p icmp --icmp-type source-quench -j ACCEPT
      
-A ufw-before-forward -p icmp --icmp-type time-exceeded -j ACCEPT
      
-A ufw-before-forward -p icmp --icmp-type parameter-problem -j ACCEPT
      
-A ufw-before-forward -p icmp --icmp-type echo-request -j ACCEPT
      

      
# allow dhcp client to work
      
-A ufw-before-input -p udp --sport 67 --dport 68 -j ACCEPT
      

      
#
      
# ufw-not-local
      
#
      
-A ufw-before-input -j ufw-not-local
      

      
# if LOCAL, RETURN
      
-A ufw-not-local -m addrtype --dst-type LOCAL -j RETURN
      

      
# if MULTICAST, RETURN
      
-A ufw-not-local -m addrtype --dst-type MULTICAST -j RETURN
      

      
# if BROADCAST, RETURN
      
-A ufw-not-local -m addrtype --dst-type BROADCAST -j RETURN
      

      
# all other non-local packets are dropped
      
-A ufw-not-local -m limit --limit 3/min --limit-burst 10 -j ufw-logging-deny
      
-A ufw-not-local -j DROP
      

      
# allow MULTICAST mDNS for service discovery (be sure the MULTICAST line above
      
# is uncommented)
      
-A ufw-before-input -p udp -d 224.0.0.251 --dport 5353 -j ACCEPT
      

      
# allow MULTICAST UPnP for service discovery (be sure the MULTICAST line above
      
# is uncommented)
      
-A ufw-before-input -p udp -d 239.255.255.250 --dport 1900 -j ACCEPT
      

      
# don't delete the 'COMMIT' line or these rules won't be processed
      
COMMIT


      UFW status verbose



      Status: active
      
Logging: on (low)
      
Default: deny (incoming), allow (outgoing), allow (routed)
      
New profiles: skip
      

      
To                         Action      From
      
--                         ------      ----
      
22/tcp                     ALLOW IN    Anywhere             
      
1194/udp                   ALLOW IN    Anywhere                                      
      
80/tcp                     ALLOW IN    Anywhere                               
      
5000/tcp                   ALLOW IN    Anywhere                                 
      
Anywhere                   ALLOW IN    80/tcp                    
      
Anywhere on tun0           ALLOW IN    Anywhere                  
      
22/tcp (v6)                ALLOW IN    Anywhere (v6)          
      
80/tcp (v6)                ALLOW IN    Anywhere (v6)                          
      
5000/tcp (v6)              ALLOW IN    Anywhere (v6)                         
      
Anywhere (v6)              ALLOW IN    80/tcp (v6)               
      
Anywhere (v6) on tun0      ALLOW IN    Anywhere (v6)             
      

      
Anywhere                   ALLOW OUT   Anywhere on tun0          
      
80/tcp                     ALLOW OUT   Anywhere on eth0                  
      
10.8.0.0/24                ALLOW OUT   Anywhere on ens5          
      
Anywhere                   ALLOW OUT   Anywhere on ens5          
      
Anywhere (v6)              ALLOW OUT   Anywhere (v6) on tun0     
      
80/tcp (v6)                ALLOW OUT   Anywhere (v6) on eth0       
      
Anywhere (v6)              ALLOW OUT   Anywhere (v6) on ens5


      Interfaces



      ip a



      1: lo: 
      
2: ens5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc mq state UP group default qlen 1000
      
    link/ether aa:aa:aa:aa:aa:aa brd ff:ff:ff:ff:ff:ff
      
    inet 172.31.39.1/20 brd 172.31.47.255 scope global dynamic ens5
      
       valid_lft 2694sec preferred_lft 2694sec
      
3: ens6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
      
    link/ether bb:bb:bb:bb:bb:bb brd ff:ff:ff:ff:ff:ff
      
    inet 172.31.39.237/20 brd 172.31.47.255 scope global ens6
      
       valid_lft forever preferred_lft forever
      
4: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 100
      
    link/none 
      
    inet 10.8.0.1/24 brd 10.8.0.255 scope global tun0
      
       valid_lft forever preferred_lft forever


      /etc/netplan/50-cloud-init.yaml



      network:
      
    version: 2
      
    ethernets:
      
        ens5: # NIC 1 = 172.31.39.1
      
            dhcp4: true
      
            match:
      
                macaddress: aa:aa:aa:aa:aa:aa
      
            set-name: ens5


      /etc/netplan/51-ens6.yaml



      network:
      
  version: 2
      
  renderer: networkd
      
  ethernets:
      
    ens6: # NIC 2 = 172.31.39.237
      
      match:
      
        macaddress: bb:bb:bb:bb:bb:bb
      
      dhcp4: no
      
      addresses: [172.31.39.237/20]
      
      routes:
      
       - to: 0.0.0.0/0
      
         via: 172.31.32.1
      
         table: 1000
      
       - to: 172.31.39.1
      
         via: 0.0.0.0
      
         scope: link
      
         table: 1000
      
      routing-policy:
      
        - from: 172.31.39.237
      
          table: 1000


      ip rule list



      0:  from all lookup local 
      
0:  from 172.31.39.237 lookup 1000 
      
32766:  from all lookup main 
      
32767:  from all lookup default


      Routing



      route -n



      Kernel IP routing table
      
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
      
0.0.0.0         172.31.32.1     0.0.0.0         UG    100    0        0 ens5
      
10.8.0.0        0.0.0.0         255.255.255.0   U     0      0        0 tun0
      
172.31.32.0     0.0.0.0         255.255.240.0   U     0      0        0 ens6
      
172.31.32.0     0.0.0.0         255.255.240.0   U     0      0        0 ens5
      
172.31.32.1     0.0.0.0         255.255.255.255 UH    100    0        0 ens5


      ip route show table all



      default via 172.31.32.1 dev ens6 table 1000 proto static 
      
172.31.39.1 dev ens6 table 1000 proto static scope link 
      
default via 172.31.32.1 dev ens5 proto dhcp src 172.31.39.1 metric 100 
      
10.8.0.0/24 dev tun0 proto kernel scope link src 10.8.0.1 
      
172.31.32.0/20 dev ens6 proto kernel scope link src 172.31.39.237 
      
172.31.32.0/20 dev ens5 proto kernel scope link src 172.31.39.1 
      
172.31.32.1 dev ens5 proto dhcp scope link src 172.31.39.1 metric 100 
      
broadcast 10.8.0.0 dev tun0 table local proto kernel scope link src 10.8.0.1 
      
local 10.8.0.1 dev tun0 table local proto kernel scope host src 10.8.0.1 
      
broadcast 10.8.0.255 dev tun0 table local proto kernel scope link src 10.8.0.1 
      
broadcast 127.0.0.0 dev lo table local proto kernel scope link src 127.0.0.1 
      
local 127.0.0.0/8 dev lo table local proto kernel scope host src 127.0.0.1 
      
local 127.0.0.1 dev lo table local proto kernel scope host src 127.0.0.1 
      
broadcast 127.255.255.255 dev lo table local proto kernel scope link src 127.0.0.1 
      
broadcast 172.31.32.0 dev ens6 table local proto kernel scope link src 172.31.39.237 
      
broadcast 172.31.32.0 dev ens5 table local proto kernel scope link src 172.31.39.1 
      
local 172.31.39.1 dev ens5 table local proto kernel scope host src 172.31.39.1 
      
local 172.31.39.237 dev ens6 table local proto kernel scope host src 172.31.39.237 
      
broadcast 172.31.47.255 dev ens6 table local proto kernel scope link src 172.31.39.237 
      
broadcast 172.31.47.255 dev ens5 table local proto kernel scope link src 172.31.39.1 
      
local ::1 dev lo proto kernel metric 256 pref medium
      
fe80::/64 dev ens6 proto kernel metric 256 pref medium
      
fe80::/64 dev ens5 proto kernel metric 256 pref medium
      
fe80::/64 dev tun0 proto kernel metric 256 pref medium
      
local ::1 dev lo table local proto kernel metric 0 pref medium
      
local fe80::88f:a9ff:fe75:11f2 dev ens6 table local proto kernel metric 0 pref medium
      
local fe80::894:3dff:fe41:89b4 dev ens5 table local proto kernel metric 0 pref medium
      
local fe80::7507:4098:a74d:65f8 dev tun0 table local proto kernel metric 0 pref medium
      
ff00::/8 dev ens6 table local metric 256 pref medium
      
ff00::/8 dev ens5 table local metric 256 pref medium
      
ff00::/8 dev tun0 table local metric 256 pref medium


      What am i missing?






      ubuntu openvpn ufw ubuntu-18.04 netplan







      share|improve this question
















      VPN client with static address 10.8.0.2 exposes ports 80 and 5000. I need to forward ports 80 and 5000 on server from NICs to the client, so i can access "forwarded" ports from outside of the VPN network.



      I've setup a 18.04 server for this, added second NIC, added basic configs (below), but VPN port forwarding does not work. NICs only respond for ICMP requests (ping works for both IPs) from outside, but it is not usable to connect to my ports.



      The setup does not work as expected - VPN port forwarding is not working at all.





      • telnet can't connect to this ports from outside (NIC1 IP = timeout, NIC2 IP = connection refused)

      • ping from outside for both NICs works

      • i've tried the tutorial Bridging and Routing from Openvpn and its iptables samples, none seem to work

      • from inside the server, i can ping -I <dev> 8.8.8.8 both with ens5 and ens6


      Firewall



      sysctl net.ipv4.ip_forward is set to 1.



      /etc/ufw/before.rules



      #
      
# rules.before
      
#
      
# Rules that should be run before the ufw command line added rules. Custom
      
# rules should be added to one of these chains:
      
#   ufw-before-input
      
#   ufw-before-output
      
#   ufw-before-forward
      
#
      

      
# START OPENVPN RULES
      
*nat
      
:POSTROUTING ACCEPT [0:0] 
      

      
-A PREROUTING -i ens5 -p tcp --dport 80 -j DNAT --to-destination 10.8.0.2
      

      
-A PREROUTING -i ens6 -p tcp --dport 5000 -j DNAT --to-destination 10.8.0.2
      

      
-A POSTROUTING -s 10.8.0.1/24 -o tun0 -j MASQUERADE
      

      
COMMIT
      

      
# END OPENVPN RULES
      

      
# Don't delete these required lines, otherwise there will be errors
      
*filter
      
:ufw-before-input - [0:0]
      
:ufw-before-output - [0:0]
      
:ufw-before-forward - [0:0]
      
:ufw-not-local - [0:0]
      
# End required lines
      

      
# allow all on loopback
      
-A ufw-before-input -i lo -j ACCEPT
      
-A ufw-before-output -o lo -j ACCEPT
      

      
# quickly process packets for which we already have a connection
      
-A ufw-before-input -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
      
-A ufw-before-output -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
      
-A ufw-before-forward -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
      

      
# drop INVALID packets (logs these in loglevel medium and higher)
      
-A ufw-before-input -m conntrack --ctstate INVALID -j ufw-logging-deny
      
-A ufw-before-input -m conntrack --ctstate INVALID -j DROP
      

      
# ok icmp codes for INPUT
      
-A ufw-before-input -p icmp --icmp-type destination-unreachable -j ACCEPT
      
-A ufw-before-input -p icmp --icmp-type source-quench -j ACCEPT
      
-A ufw-before-input -p icmp --icmp-type time-exceeded -j ACCEPT
      
-A ufw-before-input -p icmp --icmp-type parameter-problem -j ACCEPT
      
-A ufw-before-input -p icmp --icmp-type echo-request -j ACCEPT
      

      
# ok icmp code for FORWARD
      
-A ufw-before-forward -p icmp --icmp-type destination-unreachable -j ACCEPT
      
-A ufw-before-forward -p icmp --icmp-type source-quench -j ACCEPT
      
-A ufw-before-forward -p icmp --icmp-type time-exceeded -j ACCEPT
      
-A ufw-before-forward -p icmp --icmp-type parameter-problem -j ACCEPT
      
-A ufw-before-forward -p icmp --icmp-type echo-request -j ACCEPT
      

      
# allow dhcp client to work
      
-A ufw-before-input -p udp --sport 67 --dport 68 -j ACCEPT
      

      
#
      
# ufw-not-local
      
#
      
-A ufw-before-input -j ufw-not-local
      

      
# if LOCAL, RETURN
      
-A ufw-not-local -m addrtype --dst-type LOCAL -j RETURN
      

      
# if MULTICAST, RETURN
      
-A ufw-not-local -m addrtype --dst-type MULTICAST -j RETURN
      

      
# if BROADCAST, RETURN
      
-A ufw-not-local -m addrtype --dst-type BROADCAST -j RETURN
      

      
# all other non-local packets are dropped
      
-A ufw-not-local -m limit --limit 3/min --limit-burst 10 -j ufw-logging-deny
      
-A ufw-not-local -j DROP
      

      
# allow MULTICAST mDNS for service discovery (be sure the MULTICAST line above
      
# is uncommented)
      
-A ufw-before-input -p udp -d 224.0.0.251 --dport 5353 -j ACCEPT
      

      
# allow MULTICAST UPnP for service discovery (be sure the MULTICAST line above
      
# is uncommented)
      
-A ufw-before-input -p udp -d 239.255.255.250 --dport 1900 -j ACCEPT
      

      
# don't delete the 'COMMIT' line or these rules won't be processed
      
COMMIT


      UFW status verbose



      Status: active
      
Logging: on (low)
      
Default: deny (incoming), allow (outgoing), allow (routed)
      
New profiles: skip
      

      
To                         Action      From
      
--                         ------      ----
      
22/tcp                     ALLOW IN    Anywhere             
      
1194/udp                   ALLOW IN    Anywhere                                      
      
80/tcp                     ALLOW IN    Anywhere                               
      
5000/tcp                   ALLOW IN    Anywhere                                 
      
Anywhere                   ALLOW IN    80/tcp                    
      
Anywhere on tun0           ALLOW IN    Anywhere                  
      
22/tcp (v6)                ALLOW IN    Anywhere (v6)          
      
80/tcp (v6)                ALLOW IN    Anywhere (v6)                          
      
5000/tcp (v6)              ALLOW IN    Anywhere (v6)                         
      
Anywhere (v6)              ALLOW IN    80/tcp (v6)               
      
Anywhere (v6) on tun0      ALLOW IN    Anywhere (v6)             
      

      
Anywhere                   ALLOW OUT   Anywhere on tun0          
      
80/tcp                     ALLOW OUT   Anywhere on eth0                  
      
10.8.0.0/24                ALLOW OUT   Anywhere on ens5          
      
Anywhere                   ALLOW OUT   Anywhere on ens5          
      
Anywhere (v6)              ALLOW OUT   Anywhere (v6) on tun0     
      
80/tcp (v6)                ALLOW OUT   Anywhere (v6) on eth0       
      
Anywhere (v6)              ALLOW OUT   Anywhere (v6) on ens5


      Interfaces



      ip a



      1: lo: 
      
2: ens5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc mq state UP group default qlen 1000
      
    link/ether aa:aa:aa:aa:aa:aa brd ff:ff:ff:ff:ff:ff
      
    inet 172.31.39.1/20 brd 172.31.47.255 scope global dynamic ens5
      
       valid_lft 2694sec preferred_lft 2694sec
      
3: ens6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
      
    link/ether bb:bb:bb:bb:bb:bb brd ff:ff:ff:ff:ff:ff
      
    inet 172.31.39.237/20 brd 172.31.47.255 scope global ens6
      
       valid_lft forever preferred_lft forever
      
4: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 100
      
    link/none 
      
    inet 10.8.0.1/24 brd 10.8.0.255 scope global tun0
      
       valid_lft forever preferred_lft forever


      /etc/netplan/50-cloud-init.yaml



      network:
      
    version: 2
      
    ethernets:
      
        ens5: # NIC 1 = 172.31.39.1
      
            dhcp4: true
      
            match:
      
                macaddress: aa:aa:aa:aa:aa:aa
      
            set-name: ens5


      /etc/netplan/51-ens6.yaml



      network:
      
  version: 2
      
  renderer: networkd
      
  ethernets:
      
    ens6: # NIC 2 = 172.31.39.237
      
      match:
      
        macaddress: bb:bb:bb:bb:bb:bb
      
      dhcp4: no
      
      addresses: [172.31.39.237/20]
      
      routes:
      
       - to: 0.0.0.0/0
      
         via: 172.31.32.1
      
         table: 1000
      
       - to: 172.31.39.1
      
         via: 0.0.0.0
      
         scope: link
      
         table: 1000
      
      routing-policy:
      
        - from: 172.31.39.237
      
          table: 1000


      ip rule list



      0:  from all lookup local 
      
0:  from 172.31.39.237 lookup 1000 
      
32766:  from all lookup main 
      
32767:  from all lookup default


      Routing



      route -n



      Kernel IP routing table
      
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
      
0.0.0.0         172.31.32.1     0.0.0.0         UG    100    0        0 ens5
      
10.8.0.0        0.0.0.0         255.255.255.0   U     0      0        0 tun0
      
172.31.32.0     0.0.0.0         255.255.240.0   U     0      0        0 ens6
      
172.31.32.0     0.0.0.0         255.255.240.0   U     0      0        0 ens5
      
172.31.32.1     0.0.0.0         255.255.255.255 UH    100    0        0 ens5


      ip route show table all



      default via 172.31.32.1 dev ens6 table 1000 proto static 
      
172.31.39.1 dev ens6 table 1000 proto static scope link 
      
default via 172.31.32.1 dev ens5 proto dhcp src 172.31.39.1 metric 100 
      
10.8.0.0/24 dev tun0 proto kernel scope link src 10.8.0.1 
      
172.31.32.0/20 dev ens6 proto kernel scope link src 172.31.39.237 
      
172.31.32.0/20 dev ens5 proto kernel scope link src 172.31.39.1 
      
172.31.32.1 dev ens5 proto dhcp scope link src 172.31.39.1 metric 100 
      
broadcast 10.8.0.0 dev tun0 table local proto kernel scope link src 10.8.0.1 
      
local 10.8.0.1 dev tun0 table local proto kernel scope host src 10.8.0.1 
      
broadcast 10.8.0.255 dev tun0 table local proto kernel scope link src 10.8.0.1 
      
broadcast 127.0.0.0 dev lo table local proto kernel scope link src 127.0.0.1 
      
local 127.0.0.0/8 dev lo table local proto kernel scope host src 127.0.0.1 
      
local 127.0.0.1 dev lo table local proto kernel scope host src 127.0.0.1 
      
broadcast 127.255.255.255 dev lo table local proto kernel scope link src 127.0.0.1 
      
broadcast 172.31.32.0 dev ens6 table local proto kernel scope link src 172.31.39.237 
      
broadcast 172.31.32.0 dev ens5 table local proto kernel scope link src 172.31.39.1 
      
local 172.31.39.1 dev ens5 table local proto kernel scope host src 172.31.39.1 
      
local 172.31.39.237 dev ens6 table local proto kernel scope host src 172.31.39.237 
      
broadcast 172.31.47.255 dev ens6 table local proto kernel scope link src 172.31.39.237 
      
broadcast 172.31.47.255 dev ens5 table local proto kernel scope link src 172.31.39.1 
      
local ::1 dev lo proto kernel metric 256 pref medium
      
fe80::/64 dev ens6 proto kernel metric 256 pref medium
      
fe80::/64 dev ens5 proto kernel metric 256 pref medium
      
fe80::/64 dev tun0 proto kernel metric 256 pref medium
      
local ::1 dev lo table local proto kernel metric 0 pref medium
      
local fe80::88f:a9ff:fe75:11f2 dev ens6 table local proto kernel metric 0 pref medium
      
local fe80::894:3dff:fe41:89b4 dev ens5 table local proto kernel metric 0 pref medium
      
local fe80::7507:4098:a74d:65f8 dev tun0 table local proto kernel metric 0 pref medium
      
ff00::/8 dev ens6 table local metric 256 pref medium
      
ff00::/8 dev ens5 table local metric 256 pref medium
      
ff00::/8 dev tun0 table local metric 256 pref medium


      What am i missing?






      ubuntu openvpn ufw ubuntu-18.04 netplan




      ubuntu openvpn ufw ubuntu-18.04 netplan






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 2 mins ago







      Croll

















      asked 14 hours ago









      CrollCroll

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