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Dedicated IPv4 address for a KVM guest

Server Fault Asked by manifestor on December 20, 2020

I have a dedicated bare metal server, which is a KVM host and which has it’s own IPv4 address. I just ordered another seperate IPv4 address for a KVM guest and which should be used for the KVM guest only. How I can I use both IPv4 addresses, one connecting to the KVM host, the other one should be used for the KVM guest machine?

Should I create a bridge on the KVM host and share this bridge with the KVM guest? Maybe something like this:

auto eth0
iface eth0 inet manual
auto WANbr0
iface WANbr0 inet static
    hwaddress ether 00:16:3e:00:00:00
    address 1.2.3.4
    netmask 255.255.255.248
    broadcast 1.2.3.7
    gateway 1.2.3.1
    bridge_ports eth0
    bridge_stp off
    bridge_fd 0

I would make the KVM guest use the WANbr0 interface in it’s xml file and add the new separate IPv4 in /etc/network/interfaces on the guest machine.

  • Would that work?
  • Is this a good approach or is there another one, a better one?

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