[libvirt-users] Static DHCP assignments to VMs connected to bridge

[Dagmawi Biru]

Hello libvirt-users,

Given the following setup:
---
[Rest of network/dhcp server] ------[ physical interface] ------ [ bridge]
<----> | <---> [ VM ]



I have an interface configured in my Domain XML like so:
---
<interface type="bridge">
<source bridge="br20">
</interface>



Bridge "br20" is connected to an external network that has a DHCP server.
However, I want to set it so the interface for this VM has a static IP
served to it, either by a locally running DHCP server or via some sort of
static IP assignment in the XML configuration. Is this possible?

[Sam Varshavchik]

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Hello libvirt-users,
---
[Rest of network/dhcp server] ------[ physical interface] ------ [ bridge] 
<----> |  <--->  [ VM ]
---
<interface type="bridge">
    <source bridge="br20">
</interface>
Bridge "br20" is connected to an external network that has a DHCP server.
However, I want to set it so the interface for this VM has a static IP served
to it, either by a locally running DHCP server or via some sort of static IP
assignment in the XML configuration. Is this possible?

I have a DHCP server running on my LAN that defines a static mapping for my
client VMs.

If you already have a DHCP server on my LAN, and you have your client VMs
correctly bridged, and your DHCP server sees them, then it's a simple matter
of configuring your DHCP server.

Looking at my domain XML configuration, what I have is:

<interface type='bridge'>
<mac address='52:54:00:1d:a4:c2'/>
<source bridge='vnet0'/>
<model type='rtl8139'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>

Then, I just assign a static IP address mapping for this MAC address, on my
LAN's DHCP server.

If you don't have a DHCP server, you simply have to have your client VM
configured, in the client, with a fixed IP address. The client VM sees a
network port, and it is up to the client VM to set it up. libvirt is out of
the picture here.