--- src/sys/netinet/ip_input.c	2004/10/15 22:59:10	1.35
+++ src/sys/netinet/ip_input.c	2004/10/16 23:20:00	1.36
@@ -1946,6 +1946,7 @@ ip_forward(struct mbuf *m, int using_src
 	if (mcopy != NULL) {
 		mcopy->m_len = imin((IP_VHL_HL(ip->ip_vhl) << 2) + 8,
 		    (int)ip->ip_len);
+		mcopy->m_pkthdr.len = mcopy->m_len;
 		m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t));
 	}