[libvirt] bridge-to-lan interfaces with network type
Hi All, The documentation on the libvirt website explains the way to define a bridge to LAN network interfaces with a 'bridge' type. E.g.: <interface type='bridge'> <source bridge='br0'/> <mac address='52:54:00:00:00:11'/> </interface> I'm working in a limited environment. Only 'network' type interfaces can be defined for a guest. Is it possible to define a bridge-to-lan interfaces with a 'network' type? The question actually goes to: How to write a network definition xml for libvirt to use as bridge to LAN type NIC in guest? I tried with 'nat' and 'route' forward in network xml, neither works for me. Regards, Zhengang
On Tue, Feb 03, 2009 at 03:58:38PM +0800, Zhengang Li wrote:
Hi All,
The documentation on the libvirt website explains the way to define a bridge to LAN network interfaces with a 'bridge' type. E.g.: <interface type='bridge'> <source bridge='br0'/> <mac address='52:54:00:00:00:11'/> </interface>
I'm working in a limited environment. Only 'network' type interfaces can be defined for a guest. Is it possible to define a bridge-to-lan interfaces with a 'network' type? The question actually goes to: How to write a network definition xml for libvirt to use as bridge to LAN type NIC in guest?
You are mixing up terminology here. The 'network' type explicitly provides a connection where the guest only has NAT access to the LAN, while the 'bridge' type connects the guest directly to the LAN. It makes no sense to ask for 'network' to provide a direct LAN connection, since you'd just use 'bridge' for that. If you want to bridge to the LAN, you need to make sure your real eth0 device is part of a bridge. We have instructions on this setup for various distros on this page: http://wiki.libvirt.org/page/Networking Under the 'shared physical device' heading Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
Daniel P. Berrange wrote:
On Tue, Feb 03, 2009 at 03:58:38PM +0800, Zhengang Li wrote:
Hi All,
The documentation on the libvirt website explains the way to define a bridge to LAN network interfaces with a 'bridge' type. E.g.: <interface type='bridge'> <source bridge='br0'/> <mac address='52:54:00:00:00:11'/> </interface>
I'm working in a limited environment. Only 'network' type interfaces can be defined for a guest. Is it possible to define a bridge-to-lan interfaces with a 'network' type? The question actually goes to: How to write a network definition xml for libvirt to use as bridge to LAN type NIC in guest?
You are mixing up terminology here. The 'network' type explicitly provides a connection where the guest only has NAT access to the LAN, while the 'bridge' type connects the guest directly to the LAN. It makes no sense to ask for 'network' to provide a direct LAN connection, since you'd just use 'bridge' for that.
If you want to bridge to the LAN, you need to make sure your real eth0 device is part of a bridge. We have instructions on this setup for various distros on this page:
http://wiki.libvirt.org/page/Networking
Under the 'shared physical device' heading
Daniel
Sorry to bring up an old thread... with the "shared physical device", you lose the pooling capabilities that you have with the virtual network APIs. It would be nice to represent a bridge similar to how the virtual network pools are represented... I thought that was the purpose of this project: https://fedoraproject.org/wiki/Features/Shared_Network_Interface On list discussion: http://www.redhat.com/archives/libvir-list/2009-January/msg00350.html -- Kaitlin Rupert IBM Linux Technology Center kaitlin@linux.vnet.ibm.com
participants (3)
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Daniel P. Berrange -
Kaitlin Rupert -
Zhengang Li