From e1ca7196c7260d272b450ffab1fb5b539ab1ffb6 Mon Sep 17 00:00:00 2001
From: Bob Lantz <rlantz@cs.stanford.edu>
Date: Wed, 23 May 2012 13:37:02 -0700
Subject: [PATCH] configHosts(): don't try to configure nonexistent interfaces.

---
 mininet/net.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/mininet/net.py b/mininet/net.py
index 827d72f..8b9e7c8 100755
--- a/mininet/net.py
+++ b/mininet/net.py
@@ -244,7 +244,12 @@ class Mininet( object ):
         "Configure a set of hosts."
         for host in self.hosts:
             info( host.name + ' ' )
-            host.configDefault( defaultRoute=host.defaultIntf() )
+            intf = host.defaultIntf()
+            if intf:
+                host.configDefault( defaultRoute=intf )
+            else:
+                # Don't configure nonexistent intf
+                host.configDefault( ip=None, mac=None )
             # You're low priority, dude!
             # BL: do we want to do this here or not?
             # May not make sense if we have CPU lmiting...