north has a tunnel to the second interface of east, eth0 192.0.2.254
The all traffic ingress and egress via eth1, 193.1.2.23, to test
xfrmi interface is not interface specific.

The extrouded tunnel
192.0.22.0/24%eth0<=>-192.0.2.254%eth1<-->192.1.3.33%eth1-<=>192.0.3.0/24%eth0

on north:
ping -w 4 -c 4 -I 192.0.3.254 192.0.22.254
