Thursday, April 8, 2010

Using bridged networking with Virt-manager

To do this, we install the package bridge-utils...

yum install bridge-utils

... and configure a bridge. Create the file /etc/sysconfig/network-scripts/ifcfg-br0 (please use the BOOTPROTO, BROADCAST, IPADDR, NETMASK and NETWORK values from the /etc/sysconfig/network-scripts/ifcfg-eth0 file):

vi /etc/sysconfig/network-scripts/ifcfg-br0

DEVICE=br0
TYPE=Bridge
BOOTPROTO=static
BROADCAST=192.168.0.255
IPADDR=192.168.0.100
NETMASK=255.255.255.0
NETWORK=192.168.0.0
ONBOOT=yes

Modify /etc/sysconfig/network-scripts/ifcfg-eth0 as follows (comment out BOOTPROTO, BROADCAST, IPADDR, NETMASK, and NETWORK and add BRIDGE=br0):

vi /etc/sysconfig/network-scripts/ifcfg-eth0

# Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+
DEVICE=eth0
#BOOTPROTO=static
#BROADCAST=192.168.0.255
HWADDR=00:10:A7:05:AF:EB
#IPADDR=192.168.0.100
#NETMASK=255.255.255.0
#NETWORK=192.168.0.0
ONBOOT=yes
BRIDGE=br0

Restart the network...

/etc/init.d/network restart

... and run

ifconfig

It should now show the network bridge (br0):

[root@rajat1 ~]# ifconfig
br0 Link encap:Ethernet HWaddr 00:10:A7:05:AF:EB
inet addr:192.168.0.100 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::210:a7ff:fe05:afeb/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:17 errors:0 dropped:0 overruns:0 frame:0
TX packets:53 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1160 (1.1 KiB) TX bytes:14875 (14.5 KiB)

eth0 Link encap:Ethernet HWaddr 00:10:A7:05:AF:EB
inet6 addr: fe80::210:a7ff:fe05:afeb/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:13662 errors:7 dropped:160 overruns:4 frame:0
TX packets:11646 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:15144608 (14.4 MiB) TX bytes:1379942 (1.3 MiB)
Interrupt:74 Base address:0xcc00

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:38 errors:0 dropped:0 overruns:0 frame:0
TX packets:38 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4308 (4.2 KiB) TX bytes:4308 (4.2 KiB)

virbr0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:35 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:9987 (9.7 KiB)

[root@rajat1 ~]# brctl show

bridge name bridge id STP enabled interfaces
pan0 8000.000000000000 no
virbr0 8000.000000000000 yes
br0 8000.0019b97ec863 yes eth0
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