--- zzzz-none-000/linux-2.4.17/include/net/pkt_cls.h	2000-09-18 22:04:13.000000000 +0000
+++ sangam-fb-322/linux-2.4.17/include/net/pkt_cls.h	2004-11-24 13:21:34.000000000 +0000
@@ -74,6 +74,9 @@
 		    (err = tp->classify(skb, tp, res)) >= 0)
 			return err;
 	}
+	/* The cb field previously carried the original source address, 
+	 * required for classification .*/
+	*(__u32 *)skb->cb  = 0;
 	return -1;
 }