diff -u -r1.3.4.8 ip_nat_core.c
--- ip_nat_core.c	2 Sep 2003 10:21:18 -0000	1.3.4.8
+++ ip_nat_core.c	10 Sep 2003 09:22:50 -0000
@@ -516,6 +516,7 @@
 	struct ip_conntrack_tuple new_tuple, inv_tuple, reply;
 	struct ip_conntrack_tuple orig_tp;
 	struct ip_nat_info *info = &conntrack->nat.info;
+	int i;
 
 	MUST_BE_WRITE_LOCKED(&ip_nat_lock);
 	IP_NF_ASSERT(hooknum == NF_IP_PRE_ROUTING
@@ -557,7 +558,9 @@
 	}
 #endif
 
+	i = 0;
 	do {
+		if (i++ == 3) return NF_DROP;
 		if (!get_unique_tuple(&new_tuple, &orig_tp, mr, conntrack,
 				      hooknum)) {
 			DEBUGP("ip_nat_setup_info: Can't get unique for %p.\n",