[libvirt-users] What's the meaning of sub-element <ip address='X.X.X.X'> in <interface type='bridge'> of domain xml?

hujianwei jiahu at redhat.com
Fri Apr 18 07:45:07 UTC 2014

On 17/04/14 19:23, Laine Stump wrote:
> On 04/17/2014 10:42 AM, Jianwei Hu wrote:
>> Hi guys,
>> I saw this sub-element in http://libvirt.org/firewall.html, there is some confusion, what's the meaning of sub-element <ip address='X.X.X.X'> in <interface type='bridge'> of domain xml?
>> The detail <interface> in domain xml as below:
>> <interface type='bridge'>
>>    <mac address='52:54:00:56:44:32'/>
>>    <source bridge='br1'/>
>>    <ip address='10.X.X.X'/>         <===it's my question
> As far as I can find, the <ip> subelement of a domain's <interface> is:
> 1) only recognized for <interface type='bridge'> and <interface
> type='ethernet'>
> 2) only used by the xen driver, and ignored by all others.
> I believe it is the IP address that xen will tell the domain to use for
> its interface.
Thanks for your information.
> The correct way to specify a guest IP address for a nwfilter is
> described here:
>     http://libvirt.org/formatnwfilter.html#nwfconceptsvars
> The page you're citing is something lifted from an email written by
> Daniel Berrange, and it was likely written during early design of
> nwfilter and then wasn't updated to reflect what was finally implemented.
> Stefan - can you confirm or deny my suspicion?
> Beyond that, I think that page needs to be somehow updated from /
> combined with the formatnwfilter page to eliminate both duplicated and
> incorrect information.
>>    <target dev='vnet0'/>
>>    <model type='virtio'/>
>>    <filterref filter='clean-traffic'/>
>> </interface>
>> Is it static IP(specified by customer) in guest OS? or a IP of interface(e.g. eno1) in "br1" on host machine? what's definition about it?
>> [root at localhost src]# brctl show
>> bridge name	bridge id		STP enabled	interfaces
>> br1		8000.24be051881ce	no		eno1
>> If you know how to use it, please show me a detail scenario.
> Don't use it.

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