--- sys/netinet/ip_icmp.c.orig	2013-10-21 21:07:06.000000000 +0700
+++ sys/netinet/ip_icmp.c	2014-03-31 00:06:48.000000000 +0700
@@ -332,6 +332,7 @@ stdreply:	icmpelen = max(8, min(V_icmp_q
 	 * reply should bypass as well.
 	 */
 	m->m_flags |= n->m_flags & M_SKIP_FIREWALL;
+	m->m_flags &= ~(M_FRAG | M_FIRSTFRAG | M_LASTFRAG);
 	m->m_data -= sizeof(struct ip);
 	m->m_len += sizeof(struct ip);
 	m->m_pkthdr.len = m->m_len;
@@ -343,6 +344,7 @@ stdreply:	icmpelen = max(8, min(V_icmp_q
 	nip->ip_hl = 5;
 	nip->ip_p = IPPROTO_ICMP;
 	nip->ip_tos = 0;
+	nip->ip_off = 0;
 	icmp_reflect(m);
 
 freeit: