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Forwarding ICMP response to TAP interface

iptables port forwardingiptables port forward forwardingHow to configure port-forwarding to enable internal service accessed by another machine?RHEL 6 Having issues forwarding port 80 to port 8080forwarding packet from one interface to another interfaceConfig differents external proxy to every VM with iptablesiptables port forwarding to server with different portport forwarding to backend serverTaking Connection marked packet after DNAT in netfilter hookiptables port-redirect to proxy

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I am trying to do a test where I forward ICMP responses to a TAP interface. I created a TAP interface and assigned it the address 10.0.4.1/24.

My linux setup uses the interface enp0s3 as the default option. To forward any ICMP response to the TAP interface, I tried the following rules:

# iptables -t nat -A PREROUTING -i enp0s3 -p icmp -j DNAT --to 10.0.4.1

# iptables -A FORWARD -p icmp -i enp0s3 -j ACCEPT

# iptables -t nat -A POSTROUTING -o 10.0.4.1 -j MASQUERADE

At the moment, the TAP interface is in UP state, and I have a program which is listening to the TAP interface.

If I ping an external IP like 8.8.8.8, I still am able to get the response. I want to ask shouldn't the ping program not receive any response because ICMP response is getting forwarded to the TAP interface ? Also, is my approach to redirect traffic to the TAP device correct ?

iptables icmp tap

share

asked 1 min ago

JakeJake

1085

add a comment | 

0

I am trying to do a test where I forward ICMP responses to a TAP interface. I created a TAP interface and assigned it the address 10.0.4.1/24.

My linux setup uses the interface enp0s3 as the default option. To forward any ICMP response to the TAP interface, I tried the following rules:

# iptables -t nat -A PREROUTING -i enp0s3 -p icmp -j DNAT --to 10.0.4.1

# iptables -A FORWARD -p icmp -i enp0s3 -j ACCEPT

# iptables -t nat -A POSTROUTING -o 10.0.4.1 -j MASQUERADE

At the moment, the TAP interface is in UP state, and I have a program which is listening to the TAP interface.

If I ping an external IP like 8.8.8.8, I still am able to get the response. I want to ask shouldn't the ping program not receive any response because ICMP response is getting forwarded to the TAP interface ? Also, is my approach to redirect traffic to the TAP device correct ?

iptables icmp tap

share

asked 1 min ago

JakeJake

1085

add a comment | 

I am trying to do a test where I forward ICMP responses to a TAP interface. I created a TAP interface and assigned it the address 10.0.4.1/24.

My linux setup uses the interface enp0s3 as the default option. To forward any ICMP response to the TAP interface, I tried the following rules:

# iptables -t nat -A PREROUTING -i enp0s3 -p icmp -j DNAT --to 10.0.4.1

# iptables -A FORWARD -p icmp -i enp0s3 -j ACCEPT

# iptables -t nat -A POSTROUTING -o 10.0.4.1 -j MASQUERADE

At the moment, the TAP interface is in UP state, and I have a program which is listening to the TAP interface.

If I ping an external IP like 8.8.8.8, I still am able to get the response. I want to ask shouldn't the ping program not receive any response because ICMP response is getting forwarded to the TAP interface ? Also, is my approach to redirect traffic to the TAP device correct ?

iptables icmp tap

share

asked 1 min ago

JakeJake

1085

# iptables -t nat -A PREROUTING -i enp0s3 -p icmp -j DNAT --to 10.0.4.1

# iptables -A FORWARD -p icmp -i enp0s3 -j ACCEPT

# iptables -t nat -A POSTROUTING -o 10.0.4.1 -j MASQUERADE

share

asked 1 min ago

JakeJake

1085

share

asked 1 min ago

JakeJake

1085

asked 1 min ago

JakeJake

1085

asked 1 min ago

JakeJake

1085