diff -ru linux-orig/include/linux/netfilter_ipv4/ip_conntrack_tcp.h linux-new/include/linux/netfilter_ipv4/ip_conntrack_tcp.h
--- linux-orig/include/linux/netfilter_ipv4/ip_conntrack_tcp.h	2004-12-24 16:34:31.000000000 -0500
+++ linux-new/include/linux/netfilter_ipv4/ip_conntrack_tcp.h	2005-01-25 00:31:46.772442512 -0500
@@ -41,6 +41,7 @@
 	u_int8_t	retrans;	/* Number of retransmitted packets */
 	u_int8_t	last_index;	/* Index of the last packet */
 	u_int32_t	last_seq;	/* Last sequence number seen in dir */
+	u_int32_t	last_ack;	/* Last sequence number seen in opposite dir */
 	u_int32_t	last_end;	/* Last seq + len */
 };
 
diff -ru linux-orig/net/ipv4/netfilter/ip_conntrack_proto_tcp.c linux-new/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
--- linux-orig/net/ipv4/netfilter/ip_conntrack_proto_tcp.c	2005-01-25 00:46:13.192726608 -0500
+++ linux-new/net/ipv4/netfilter/ip_conntrack_proto_tcp.c	2005-01-25 00:43:35.340723760 -0500
@@ -665,11 +665,13 @@
 		if (*index == TCP_ACK_SET) {
 			if (state->last_dir == dir
 			    && state->last_seq == seq
+			    && state->last_ack == ack
 			    && state->last_end == end)
 				state->retrans++;
 			else {
 				state->last_dir = dir;
 				state->last_seq = seq;
+				state->last_ack = ack;
 				state->last_end = end;
 				state->retrans = 0;
 			}