How to create a bridge between ETH1, ETH2, ETH3

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This article describes how to create a bridge between ETH1/ETH2/ETH3.

Bridge setup

Here are the steps to configure this setup.

Bring up end1/sw0ep interface/IP Forward enable:

ifconfig end0 169.254.1.1 up
ifconfig sw0p2 192.168.0.20 up
echo 1 > /proc/sys/net/ipv4/ip_forward

IP forwarding in Linux refers to setting your Linux to accept incoming network packets and forwarding them to another network

Bring up Device1 interface:

ifconfig eth0 169.254.1.2 up
ip route add default via 169.254.1.1

Bring up Device2 interface:

ifconfig eth0 192.168.0.11 up
ip route add default via 192.168.0.10

Device1 and Device2 are now visible each other.