sample_routers.nsim

add host
add host
add router 5

assign-ip 3 eth0 10.0.0.1
assign-ip 1 eth0 10.0.0.2

assign-ip 3 eth1 20.0.0.1
assign-ip 2 eth0 20.0.0.2

connect 3 eth0 1 eth0
connect 3 eth1 2 eth0

add host
add host
add router 5

assign-ip 6 eth0 30.0.0.1
assign-ip 3 eth3 30.0.0.2

assign-ip 6 eth1 40.0.0.1
assign-ip 4 eth0 40.0.0.2

connect 6 eth0 3 eth3
connect 6 eth1 4 eth0

send 1 40.0.0.2 h