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jkoop
Asked: 2022-01-19 19:35:04 +0800 CST

How to relay packets for another network to that interface (not a gateway or bridge)

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I have a server on two separate LANs: enp3s0 (10.0.0.5/24) and tun0 (10.8.0.5/24, openvpn client). I've configured the gateways on both networks to forward packets addressed to the other network to this server. How can I get this server to relay those packet to the other (correct) interface? I've tried all of the iptables stuff I can find.

The server is running Ubuntu Server 20.04.

ubuntu

0 Answers

  1. Did you activate kernel forwarding?

    echo 1> /proc/sys/net/ipv4/ip_forward

    or

    sysctl -w net.ipv4.ip_forward=1

    Your box will act as a router, not as a workstation, and this behaviour is disabled by default, for security reasons! Be sure to permit forward for only legit network ranges from both of your nets using iptables.

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