Index: pipex.c
===================================================================
RCS file: /cvs/src/sys/net/pipex.c,v
retrieving revision 1.85
diff -u -p -r1.85 pipex.c
--- pipex.c	4 Mar 2016 22:38:23 -0000	1.85
+++ pipex.c	22 Mar 2016 11:55:42 -0000
@@ -2568,7 +2568,7 @@ pipex_mppe_output(struct mbuf *m0, struc
 	 */
 	for (m = m0; m != NULL; m = m->m_next) {
 		if (M_READONLY(m)) {
-			m = m_copym2(m0, 0, M_COPYALL, M_NOWAIT);
+			m = m_dup_pkt(m0, max_linkhdr, M_NOWAIT);
 			if (m == NULL)
 				goto drop;
 			m_freem(m0);