Need correct iptable rules for NAT instance to prevent loop back for private subnet EC2 instance outgoing...
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Need correct iptable rules for NAT instance to prevent loop back for private subnet EC2 instance outgoing traffic
Can not access https from my ubuntu EC2 instanceHow to configure traffic from a specific IP hardcoded to an IP to forward to another IP:PORT using iptables?Forward http traffic to another ip address with iptablesIptables stringejabberd on vm not connect to another xmmp server (iptables dnat dport 5269)How to configure port-forwarding to enable internal service accessed by another machine?Config differents external proxy to every VM with iptablesRedirect works from external network, but not internal(dnat|redirect) with masquerade doesn't workiptables port-redirect to proxyNeed help in finding reason behind EC2 instance not able to initiate any outgoing network activity
My AWS architecture has a public subnet having a NAT instance. It forwards the traffic on certain ports to my EC2 instance hosted in a separate private subnet.
sudo iptables -t nat -A PREROUTING -p tcp --dport 80 -j DNAT
--to-destination 10.0.1.126:80
But I also need to provide outgoing internet access to my private EC2 instances.
sudo iptables -t nat -A POSTROUTING -o eth0 -s 10.0.1.0/24 -j
MASQUERADE
This results in all the request generated by my private EC2 instance to loop back to itself. Which rule needs to be modified to prevent this behaviour and outgoing traffic generated by private EC2 instance are sent without being routed back?
UPDATE: I added destination ip as my public ip for Port 80
sudo iptables -t nat -A PREROUTING -p tcp -d xx.xx.xx.xx --dport 80 -j DNAT
--to-destination 10.0.1.126:80
Although my outgoing network call was not looped back but my dns based domain request are not getting passed to my instance.
iptables routing nat dnat masquerade
New contributor
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My AWS architecture has a public subnet having a NAT instance. It forwards the traffic on certain ports to my EC2 instance hosted in a separate private subnet.
sudo iptables -t nat -A PREROUTING -p tcp --dport 80 -j DNAT
--to-destination 10.0.1.126:80
But I also need to provide outgoing internet access to my private EC2 instances.
sudo iptables -t nat -A POSTROUTING -o eth0 -s 10.0.1.0/24 -j
MASQUERADE
This results in all the request generated by my private EC2 instance to loop back to itself. Which rule needs to be modified to prevent this behaviour and outgoing traffic generated by private EC2 instance are sent without being routed back?
UPDATE: I added destination ip as my public ip for Port 80
sudo iptables -t nat -A PREROUTING -p tcp -d xx.xx.xx.xx --dport 80 -j DNAT
--to-destination 10.0.1.126:80
Although my outgoing network call was not looped back but my dns based domain request are not getting passed to my instance.
iptables routing nat dnat masquerade
New contributor
add a comment |
My AWS architecture has a public subnet having a NAT instance. It forwards the traffic on certain ports to my EC2 instance hosted in a separate private subnet.
sudo iptables -t nat -A PREROUTING -p tcp --dport 80 -j DNAT
--to-destination 10.0.1.126:80
But I also need to provide outgoing internet access to my private EC2 instances.
sudo iptables -t nat -A POSTROUTING -o eth0 -s 10.0.1.0/24 -j
MASQUERADE
This results in all the request generated by my private EC2 instance to loop back to itself. Which rule needs to be modified to prevent this behaviour and outgoing traffic generated by private EC2 instance are sent without being routed back?
UPDATE: I added destination ip as my public ip for Port 80
sudo iptables -t nat -A PREROUTING -p tcp -d xx.xx.xx.xx --dport 80 -j DNAT
--to-destination 10.0.1.126:80
Although my outgoing network call was not looped back but my dns based domain request are not getting passed to my instance.
iptables routing nat dnat masquerade
New contributor
My AWS architecture has a public subnet having a NAT instance. It forwards the traffic on certain ports to my EC2 instance hosted in a separate private subnet.
sudo iptables -t nat -A PREROUTING -p tcp --dport 80 -j DNAT
--to-destination 10.0.1.126:80
But I also need to provide outgoing internet access to my private EC2 instances.
sudo iptables -t nat -A POSTROUTING -o eth0 -s 10.0.1.0/24 -j
MASQUERADE
This results in all the request generated by my private EC2 instance to loop back to itself. Which rule needs to be modified to prevent this behaviour and outgoing traffic generated by private EC2 instance are sent without being routed back?
UPDATE: I added destination ip as my public ip for Port 80
sudo iptables -t nat -A PREROUTING -p tcp -d xx.xx.xx.xx --dport 80 -j DNAT
--to-destination 10.0.1.126:80
Although my outgoing network call was not looped back but my dns based domain request are not getting passed to my instance.
iptables routing nat dnat masquerade
iptables routing nat dnat masquerade
New contributor
New contributor
edited 7 hours ago
Debasish Mitra
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asked 13 hours ago
Debasish MitraDebasish Mitra
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Your PREROUTING must exclude the local traffic, i.e.
iptables -t nat -A PREROUTING -p tcp ! --source 10.0.1.0/24 --dport 80 -j DNAT --to-destination 10.0.1.126:80
Note the exclamation mark before source: ! --source 10.0.1.0/24
. That ensures that the rule is only evaluated for traffic coming from outside.
Hope that helps :)
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1 Answer
1
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votes
1 Answer
1
active
oldest
votes
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votes
Your PREROUTING must exclude the local traffic, i.e.
iptables -t nat -A PREROUTING -p tcp ! --source 10.0.1.0/24 --dport 80 -j DNAT --to-destination 10.0.1.126:80
Note the exclamation mark before source: ! --source 10.0.1.0/24
. That ensures that the rule is only evaluated for traffic coming from outside.
Hope that helps :)
add a comment |
Your PREROUTING must exclude the local traffic, i.e.
iptables -t nat -A PREROUTING -p tcp ! --source 10.0.1.0/24 --dport 80 -j DNAT --to-destination 10.0.1.126:80
Note the exclamation mark before source: ! --source 10.0.1.0/24
. That ensures that the rule is only evaluated for traffic coming from outside.
Hope that helps :)
add a comment |
Your PREROUTING must exclude the local traffic, i.e.
iptables -t nat -A PREROUTING -p tcp ! --source 10.0.1.0/24 --dport 80 -j DNAT --to-destination 10.0.1.126:80
Note the exclamation mark before source: ! --source 10.0.1.0/24
. That ensures that the rule is only evaluated for traffic coming from outside.
Hope that helps :)
Your PREROUTING must exclude the local traffic, i.e.
iptables -t nat -A PREROUTING -p tcp ! --source 10.0.1.0/24 --dport 80 -j DNAT --to-destination 10.0.1.126:80
Note the exclamation mark before source: ! --source 10.0.1.0/24
. That ensures that the rule is only evaluated for traffic coming from outside.
Hope that helps :)
answered 6 hours ago
MLuMLu
8,66712142
8,66712142
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Debasish Mitra is a new contributor. Be nice, and check out our Code of Conduct.
Debasish Mitra is a new contributor. Be nice, and check out our Code of Conduct.
Debasish Mitra is a new contributor. Be nice, and check out our Code of Conduct.
Debasish Mitra is a new contributor. Be nice, and check out our Code of Conduct.
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