How to change the ip address and DHCP range assigned for "virbr0" interface inside KVM in RHEL6?

Solution Verified - Updated -

Issue

  • Using KVM / virsh when running under RHEL a virbr0 is used for NAT traffic between the guest and the running OS on the RHEL server.

  • Is there a way to configure virbr0 to be on a particular network, rather than the default of the 192.168.122/24 network.

[root@localhost ~]# cat /etc/redhat-release; ifconfig virbr0
Red Hat Enterprise Linux Server release 6.5 (Santiago)
virbr0    Link encap:Ethernet  HWaddr 52:54:00:CA:D7:3E  
          inet addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

Environment

  • Red Hat Enterprise Linux (RHEL) 6.

  • KVM virtualization.

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