Paste mininet dump here: *** Dumping network connections s1 lo: s1-eth1:receiver-eth0 s1-eth2:h1-eth0 s1-eth3:s2-eth1 s2 lo: s2-eth1:s1-eth3 s2-eth2:h2-eth0 s2-eth3:s3-eth1 s3 lo: s3-eth1:s2-eth3 s3-eth2:h3-eth0 h1 h1-eth0:s1-eth2 h2 h2-eth0:s2-eth2 h3 h3-eth0:s3-eth2 receiver receiver-eth0:s1-eth1 redraw Source on Github.