diff -uprN net-next-2.6/net/ipv4/arp.c net-next-2.6.my/net/ipv4/arp.c
--- net-next-2.6/net/ipv4/arp.c	2009-07-01 01:00:58.000000000 +0300
+++ net-next-2.6.my/net/ipv4/arp.c	2009-07-01 01:24:19.000000000 +0300
@@ -811,11 +811,9 @@ static int arp_process(struct sk_buff *s
 		    !arp_ignore(in_dev, sip, tip))
 			arp_send(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha,
 				 dev->dev_addr, sha);
-		goto out;
-	}
-
-	if (arp->ar_op == htons(ARPOP_REQUEST) &&
-	    ip_route_input(skb, tip, sip, 0, dev) == 0) {
+		if (sip == 0) goto out;
+	} else if (arp->ar_op == htons(ARPOP_REQUEST) &&
+		    ip_route_input(skb, tip, sip, 0, dev) == 0) {
 
 		rt = skb_rtable(skb);
 		addr_type = rt->rt_type;