2 router = r1, transport = t1
3 host host 127.0.0.1 [127.0.0.1] port=1225
4 host host 127.0.0.1 [127.0.0.1] port=1226
5 host host 127.0.0.1 [127.0.0.1] port=1227
6 host host ipv4.ipv4.ipv4.ipv4 [ipv4.ipv4.ipv4.ipv4] port=1228
7 host host ipv4.ipv4.ipv4.ipv4 [ipv4.ipv4.ipv4.ipv4] port=1223