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Index: sys/netinet6/icmp6.c
===================================================================
RCS file: /home/ncvs/src/sys/netinet6/icmp6.c,v
retrieving revision 1.80.2.4
diff -u -p -r1.80.2.4 icmp6.c
--- sys/netinet6/icmp6.c 31 Aug 2008 21:54:24 -0000 1.80.2.4
+++ sys/netinet6/icmp6.c 1 Sep 2008 23:03:44 -0000
@@ -1117,6 +1117,15 @@ icmp6_mtudisc_update(struct ip6ctlparam
if (!validated)
return;
+ /*
+ * In case the suggested mtu is less than IPV6_MMTU, we
+ * only need to remember that it was for above mentioned
+ * "alwaysfrag" case.
+ * Try to be as close to the spec as possible.
+ */
+ if (mtu < IPV6_MMTU)
+ mtu = IPV6_MMTU - 8;
+
bzero(&inc, sizeof(inc));
inc.inc_flags = 1; /* IPv6 */
inc.inc6_faddr = *dst;
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