<Srinivas_G_Gowda@dell.com>
2014-May-20 08:59 UTC
[libvirt-users] Need help with [virt net-create]
Is it possible to configure 2 virtual nics in the same ip range ?
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 ?
Thanks,
G
Daniel P. Berrange
2014-May-20 13:01 UTC
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 :|
<Srinivas_G_Gowda@dell.com>
2014-May-20 13:35 UTC
Re: [libvirt-users] Need help with [virt net-create]
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/6/html-single/Virtualization_Administration_Guide/index.html#sect-network-protocols 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 :|