diff --git a/net-next-2.6/net/ipv4/arp.c b/linux-net-next-a/net/ipv4/arp.c
index 3f6b735..5afaf2a 100644
--- a/net-next-2.6/net/ipv4/arp.c
+++ b/linux-net-next-a/net/ipv4/arp.c
@@ -801,8 +801,11 @@ static int arp_process(struct sk_buff *skb)
  *  cache.
  */
 
-	/* Special case: IPv4 duplicate address detection packet (RFC2131) */
-	if (sip == 0) {
+	/* 
+	*  Special case: IPv4 duplicate address detection packet (RFC2131)
+	*  and Gratuitous ARP/ARP Announce. (RFC3927, Section 2.4) 
+	*/
+	if (sip == 0 || tip == sip) {
 		if (arp->ar_op == htons(ARPOP_REQUEST) &&
 		    inet_addr_type(net, tip) == RTN_LOCAL &&
 		    !arp_ignore(in_dev, sip, tip))