create memif socket id $sid1 filename $socket1
create interface memif id $mid1 socket-id $sid1 hw-addr $mac1 $role1
set interface ip address memif$sid1/$mid1 1.1.$sid1.1/24
set interface state memif$sid1/$mid1 up

create memif socket id $sid2 filename $socket2
create interface memif id $mid2 socket-id $sid2 hw-addr $mac2 $role2
set interface ip address memif$sid2/$mid2 1.1.$sid2.1/24
set interface state memif$sid2/$mid2 up

set ip neighbor static memif$sid1/$mid1 1.1.$sid1.2 $vif1_mac
set ip neighbor static memif$sid2/$mid2 1.1.$sid2.2 $vif2_mac

ip route add 10.0.0.0/8 via 1.1.$sid1.2
ip route add 20.0.0.0/8 via 1.1.$sid2.2