stdin:8: invalid interface name '10.1.2.3'
stdin:9: invalid interface name '10.1.2.3:0'
nat on lo0 all -> (lo0) round-robin
nat on lo0 all -> (lo0:0)
nat on lo0 all -> (nonexistant0) round-robin
nat on lo0 all -> (nonexistant0:0)