Ubuntu 11.04 : KVM : configure multiple bridges

Here’s an explanation of how to configure multiple bridges.

My server has multiple NICs.

I’ve already associated eth2 with br0

# brctl show bridge name     bridge id               STP enabled     interfaces br0             8000.002655e1ezzz       no              eth2 virbr0          8000.000000000000       yes

I’m going to associate eth3 with br1.

cat /etc/network/interfaces

auto eth2 iface eth2 inet manual auto br0 iface br0 inet static        address 10.0.10.14        netmask 255.255.255.0        network 10.0.10.0        gateway 10.0.10.254        bridge_ports eth2        bridge_stp off        bridge_fd 0        bridge_maxwait 0

edit  /etc/network/interfaces

make a bridge ( br1 ) for eht3 and associate it with eth3

24 auto eth3     25 #iface eth3 inet static     26 #       address 10.0.20.14     27 #       netmask 255.255.255.0     28 iface eth3 inet manual     29     30     31 auto br1     32 iface br1 inet static     33         address 10.0.20.14     34         netmask 255.255.255.0     35         network 10.0.20.0     36         gateway 10.0.20.254     37         bridge_ports eth3     38         bridge_stp off     39         bridge_fd 0     40         bridge_maxwait 0

restart network script

# /etc/init.d/networking restart

# brctl show bridge name     bridge id               STP enabled     interfaces br0             8000.002655e1ezzz       no              eth2 br1             8000.002655e1exxx       no              eth3 virbr0          8000.000000000000       yes