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Last active July 11, 2023 08:17
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How to create a network bridge in Linux
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linux-bridge.md

How to create a network bridge in Linux

Requirements

Check if iproute2 is installed.

dpkg -s iproute2

Configuration

Create a bridge interface.

ip link add name bridge0 type bridge

Add interfaces to the brigde.

ip link set eth0 master bridge0
ip link set eth1 master bridge0

Show interfaces added to the bridge.

bridge link show

Internet access on the bridge

Add an IP address to the bridge interface.

ip addr add 192.168.1.254/24 dev bridge0

Add a default gateway.

ip route add default via 192.168.1.1 dev bridge0

Monitoring with tcpdump

Check if tcpdump is installed.

dpkg -s tcpdump

Monitoring traffic.

tcpdump -i bridge0 -nn "icmp"
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