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	diff --git a/sys/netipsec/ipsec_output.c b/sys/netipsec/ipsec_output.c
	--- a/sys/netipsec/ipsec_output.c
	+++ b/sys/netipsec/ipsec_output.c
	@@ -305,7 +305,6 @@
	uint32_t idx;
	int error;

	-
	/* Don't check PMTU if the frame won't have DF bit set. */
	if (!V_ip4_ipsec_dfbit)
	return (0);
	@@ -335,15 +334,22 @@
	}

	dst = &sav->sah->saidx.dst;
	-
	- /* Final header is not ipv4. */
	- if (dst->sa.sa_family != AF_INET) {
	+ memset(&inc, 0, sizeof(inc));
	+ switch (dst->sa.sa_family) {
	+ case AF_INET:
	+ inc.inc_faddr = satosin(&dst->sa)->sin_addr;
	+ break;
	+#ifdef INET6
	+ case AF_INET6:
	+ inc.inc6_faddr = satosin6(&dst->sa)->sin6_addr;
	+ inc.inc_flags \|= INC_ISIPV6;
	+ break;
	+#endif
	+ default:
	key_freesav(&sav);
	return (0);
	}

	- memset(&inc, 0, sizeof(inc));
	- inc.inc_faddr = satosin(&dst->sa)->sin_addr;
	key_freesav(&sav);
	pmtu = tcp_hc_getmtu(&inc);
	/* No entry in hostcache. */