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-                      v80
+                      v81
   You should see at least two table entries: One for ICMP Echo (icmp_code=8) messages from host1 to host2 and one for ICMP Echo Reply (icmp_code=0) messages from host2 to host1.  You may also see flow entries for arp packets.
 . To see messages go between your switch and your controller (listening on port 6633 of your localhost), run tcpdump on your loopback interface:
   {{{
   sudo tcpdump -i l0
+. To see messages go between your switch and your controller (listening on port 6633 of your localhost), run tcpdump on your eth0 interface:
+  {{{
+  sudo tcpdump -i eth0
   }}}
   You will see (1) periodic keepalive messages  being exchanged by the switch and the controller, (2) messages from the switch to the controller (e.g. when there is a table miss) and an ICMP Echo message in, and (3) messages from the controller to the switch (e.g. to install new flow entries).