Re: Static DHCP assignments to VMs connected to bridge

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Dagmawi Biru writes:

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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?

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.


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