Thanks Daniel. Why was I trying to do something like this ? Two reasons 1. I was referring to ( Figure 18.4. Virtual network switch running dnsmasq) https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/... that appears to be two virtual nics sharing the same IP range .. !!! 2. was playing around "Network teaming" in a VM. But this doesnt seem to work. Please dont beat me around the use cases for this :) Do we have support for "Network teaming inside a VM" ? This seems to be well documented for VMware and Hyper-V, could not find related document on this for libvirt. Thanks. G ________________________________________ From: Daniel P. Berrange [berrange@redhat.com] Sent: Tuesday, May 20, 2014 6:31 PM To: Gowda, Srinivas G Cc: libvirt-users@redhat.com Subject: Re: [libvirt-users] Need help with [virt net-create] On Tue, May 20, 2014 at 01:59:42AM -0700, Srinivas_G_Gowda@dell.com wrote:
Is it possible to configure 2 virtual nics in the same ip range ?
Nope, that's unsupported. We need to key various things off the IP address + mask used for the NIC, so you can't have multiple nets with the same address + mask.
Here is what I am trying.
**** This works **************** cat nw1.xml <network> <name>nw1</name> <domain name='nw1' /> <forward mode='nat' dev='eth2'/> <ip address='192.168.101.1' netmask='255.255.255.0'> <dhcp> <range start='192.168.101.128' end='192.168.101.254'/> </dhcp> </ip> </network>
[root@localhost nw]# virsh net-create nw1.xml Network nw1 created from nw1.xml
[root@localhost nw]# virsh net-list --all Name State Autostart Persistent ---------------------------------------------------------- nw1 active no no default active yes yes
****** FAILS when given the same ip address range of an existing virtual interface ******* [root@localhost nw]# cat nw2.xml <network> <name>nw2</name> <domain name='nw2' /> <forward mode='nat' dev='eth2'/> <ip address='192.168.101.1' netmask='255.255.255.0'> <dhcp> <range start='192.168.101.128' end='192.168.101.254'/> </dhcp> </ip> </network>
[root@localhost nw]# virsh net-create nw2.xml error: Failed to create network from nw2.xml error: internal error: Network is already in use by interface virbr1
****** PASS - on giving diff ip range ******* [root@localhost nw]# cat nw3.xml <network> <name>nw3</name> <domain name='nw3' /> <forward mode='nat' dev='eth2'/> <ip address='192.168.102.1' netmask='255.255.255.0'> <dhcp> <range start='192.168.102.128' end='192.168.102.254'/> </dhcp> </ip> </network>
[root@localhost nw]# virsh net-create nw3.xml Network nw3 created from nw3.xml
[root@localhost nw]# virsh net-list --all Name State Autostart Persistent ---------------------------------------------------------- nw1 active no no nw3 active no no default active yes yes
Any suggestions on what could be wrong here ?
Can you instead explain why you're trying to setup multiple networks with the same IP addr/mask in the first place. Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|