There is a workaround in the official documentation, however I'm not very satisfied with it. You can use the network type phys
to pair up a network interface with a dummy interface on the host side;
lxc.network.type = phys lxc.network.flags = up lxc.network.link = dummy0 lxc.network.hwaddr = 4a:49:43:49:79:ff lxc.network.ipv4 = 10.2.3.6/24 lxc.network.ipv6 = 2003:db8:1:0:214:1234:fe0b:3297