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exeral
Asked: 2020-11-27 10:11:29 +0800 CST

iptables tee rewrite destination IP

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  • I have server A: memcache server 10.0.0.1:11211
  • I have server B: memcache server 192.168.0.1:11211
  • I have full access to server A. I have no access to server B

I want to replicate traffic received on 10.0.0.1:11211 to 192.168.0.1:11211

I have set a this rule: iptables -t mangle -A PREROUTING -i eth0 -p TCP --dport 11211 -j TEE --gateway 192.168.0.1

I can see server B receive the packet, however the destination IP is still 10.0.0.1

How can I modify the packet on server A so it goes to the network with 192.168.0.1 destination IP ?

linux networking iptables

1 Answers

  1. answering myself: never succeeded with iptables. maybe it's impossible because of TCP connected state.

    instead, got it working with https://github.com/RobinUS2/teecp

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