correct ports in example

README.md

@@ -194,7 +194,7 @@ Now
 will work. And, more interestingly,
 
     host2# ping 10.0.1.1
-    host2# echo 'Hello, world.' | nc -u 10.0.1.1 1122
+    host2# echo 'Hello, world.' | nc -u 10.0.1.1 4422
 
 will work too, which is interacting with a container that resides on
 $HOST1.
@@ -228,7 +228,7 @@ container with IP 10.0.1.1.
 With the above in place, we can connect to our 'nc' service from
 anywhere with
 
-    echo 'Hello, world.' | nc -u $HOST2 4422
+    echo 'Hello, world.' | nc -u $HOST2 2211
 
 (NB: due to the way routing is handled in the Linux kernel, this won't
 work when run *on* $HOST2.)