===== net/ipv4/ip_output.c 1.80 vs edited =====
--- 1.80/net/ipv4/ip_output.c	2005-03-19 05:43:26 +11:00
+++ edited/net/ipv4/ip_output.c	2005-03-21 21:36:51 +11:00
@@ -1152,7 +1152,8 @@
 	 * If local_df is set too, we still allow to fragment this frame
 	 * locally. */
 	if (inet->pmtudisc == IP_PMTUDISC_DO ||
-	    (!skb_shinfo(skb)->frag_list && ip_dont_fragment(sk, &rt->u.dst)))
+	    (skb->len <= dst_mtu(&rt->u.dst) &&
+	     ip_dont_fragment(sk, &rt->u.dst)))
 		df = htons(IP_DF);
 
 	if (inet->cork.flags & IPCORK_OPT)