Index: sys/net/radix.c
===================================================================
RCS file: /cvsroot/src/sys/net/radix.c,v
retrieving revision 1.43
diff -u -p -r1.43 radix.c
--- sys/net/radix.c	27 May 2009 17:46:50 -0000	1.43
+++ sys/net/radix.c	23 Aug 2010 11:50:07 -0000
@@ -559,12 +559,15 @@ rn_lexobetter(
 	const u_char *lim;
 
 	if (*mp > *np)
-		return 1;  /* not really, but need to check longer one first */
-	if (*mp == *np)
-		for (lim = mp + *mp; mp < lim;)
-			if (*mp++ > *np++)
-				return 1;
-	return 0;
+ 		return 1;
+	if (*mp < *np)
+		return 0;
+	/*
+	 * Must return the first difference between the masks
+	 * to ensure deterministic sorting.
+	 */
+	lim = mp + *mp;
+	return (memcmp(mp, np, *lim) > 0);
 }
 
 static struct radix_mask *