--- ipfwadm.c
+++ ipfwadm.c	1996/07/02 10:44:07
@@ -1670,6 +1670,7 @@
 
 	iph->version = IP_VERSION;
 	iph->ihl = sizeof(struct iphdr) / 4;
+	iph->tot_len = sizeof(struct ip_fwpkt);
 	iph->frag_off &= htons(~IP_OFFSET);
 
 	iph->saddr = fw->fw_src.s_addr;

.