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_Lin...
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(a)redhat.com]
Sent: Tuesday, May 20, 2014 6:31 PM
To: Gowda, Srinivas G
Cc: libvirt-users(a)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(a)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
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