--- tcp_input.c.orig	Wed Feb 23 00:45:47 2000
+++ tcp_input.c	Wed Feb 23 00:55:32 2000
@@ -482,2 +482,11 @@
 
+	/*
+	 * Drop all packets with a sequence or acknowledgment number of
+	 * zero if the RST flag isn't set.
+	 * Omachonu Ogali <oogali@intranova.net>
+	 *
+	 */
+	if ((!(thflags & TH_RST)) && (((th_seq == 0) || (th_ack == 0)) || ((th_seq == 0) && (th_ack == 0)))) {
+		goto drop;
+
 #ifdef TCP_DROP_SYNFIN