Bridge

You will need a (software) network bridge on your computer if you

• Set up a wireless accesspoint
• use kvm virtualization

Setup

To set up a bridge you need to find out your distribution and proceed accordingly:

Ubuntu

• install brctl:

sudo apt-get install bridge-utils

• verify your bridge br0 has been set up:

tstaerk@dell-desktop:~$ brctl addbr br0
add bridge failed: Operation not permitted
tstaerk@dell-desktop:~$ sudo brctl addbr br0
tstaerk@dell-desktop:~$ ip a s
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000
    link/ether 00:22:19:f7:3c:bb brd ff:ff:ff:ff:ff:ff
3: wmaster0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
    link/ieee802.11 00:22:fb:89:57:06 brd ff:ff:ff:ff:ff:ff
4: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 1000
    link/ether 00:22:fb:89:57:06 brd ff:ff:ff:ff:ff:ff
5: pan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN 
    link/ether d6:2a:40:12:ff:bc brd ff:ff:ff:ff:ff:ff
6: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 3
    link/ppp 
    inet 10.57.81.93 peer 10.64.64.64/32 scope global ppp0
'''''7: br0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN '''''
    link/ether 06:ed:32:47:91:a2 brd ff:ff:ff:ff:ff:ff

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