D35871.diff
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	diff --git a/sys/netinet6/icmp6.c b/sys/netinet6/icmp6.c
	--- a/sys/netinet6/icmp6.c
	+++ b/sys/netinet6/icmp6.c
	@@ -1111,6 +1111,7 @@
	struct mbuf m = ip6cp->ip6c_m; / will be necessary for scope issue */
	u_int mtu = ntohl(icmp6->icmp6_mtu);
	struct in_conninfo inc;
	+ uint32_t max_mtu;

	#if 0
	/*
	@@ -1151,7 +1152,11 @@
	if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL))
	return;

	- if (mtu < tcp_maxmtu6(&inc, NULL)) {
	+ max_mtu = tcp_hc_getmtu(&inc);
	+ if (max_mtu == 0)
	+ max_mtu = tcp_maxmtu6(&inc, NULL);
	+
	+ if (mtu < max_mtu) {
	tcp_hc_updatemtu(&inc, mtu);
	ICMP6STAT_INC(icp6s_pmtuchg);
	}