KVM bridge public IPv4 (which is /32) ino VM

[Tobias_DE_EN_PL]

Hello,

I have a KVM host which has only one NIC and one public IPv4 adress (a.b.c.d/32) and a IPv6 /64 address block.

My plan is to connect to the he KVM host via IPv6 only and bridge the IPv4 into a VM and use it there.

Here my ifcfg-eth0, ifcfg-br0 and vm network adapter setup:

Code: Select all

ifcfg-eth0:
DEVICE=eth0
ONBOOT=yes
BRIDGE=br0

ifcfg-br0:
DEVICE=br0
TYPE=Bridge
BOOTPROTO=static
ONBOOT=yes
DELAY=0
IPV6ADDR=<ipv6>::1/64
IPV6_AUTOCONF=yes

IPADDR=192.168.254.254 # dummy IPv4 for spice to run properly, does not run on IPv6 only hosts
PREFIX=24

brctl show
bridge name	bridge id		STP enabled	interfaces
br0		8000.764dcc93d98a	no		eth0
								vnet0
virsh dumpxml (network adapter):
 <interface type='bridge'>
      <mac address='xxx'/>
      <source bridge='br0'/>
      <target dev='vnet0'/>
      <model type='virtio'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>

When I set manually the IPv4 address in the VM I am unable to ping anywhere not even to the IPv4 gateway.
Does the mac adress of the virtual network device have to be the same as the physical device or must they differ?

What am I doing wrong here?

Many thanks,
Tobias