+ diff -u ./net/ipv4/arp.c.APAPI ./net/ipv4/arp.c
--- ./net/ipv4/arp.c.APAPI	Tue Aug 12 13:00:59 2003
+++ ./net/ipv4/arp.c	Tue Aug 12 14:32:40 2003
@@ -760,6 +760,18 @@
 		goto out;
 	}

+#define MAKE_MS_WINDOWS_HAPPY
+#ifdef MAKE_MS_WINDOWS_HAPPY
+	/* Special case: IPv4 duplicate address detection packet (MS Windows) */
+	if (inet_addr_type(sip) == RTN_LOCAL) {
+		printk("ARP: IPv4 duplicate address detection packet (MS Windows)\n");
+		if (arp->ar_op == htons(ARPOP_REQUEST) &&
+		    inet_addr_type(tip) == RTN_LOCAL)
+			arp_send(ARPOP_REPLY,ETH_P_ARP,tip,dev,tip,sha,dev->dev_addr,dev->dev_addr);
+		goto out;
+	}
+#endif
+
 	if (arp->ar_op == htons(ARPOP_REQUEST) &&
 	    ip_route_input(skb, tip, sip, 0, dev) == 0) {