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diff -ru unbound-1.5.1-orig/services/listen_dnsport.c unbound-1.5.1/services/listen_dnsport.c
--- unbound-1.5.1-orig/services/listen_dnsport.c 2014-09-16 15:49:21.000000000 +0200
+++ unbound-1.5.1/services/listen_dnsport.c 2014-12-21 08:15:39.126734451 +0100
@@ -361,6 +361,7 @@
}
# endif /* IPv6 MTU */
} else if(family == AF_INET) {
+ int omit = 0;
# if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT)
/* linux 3.15 has IP_PMTUDISC_OMIT, Hannes Frederic Sowa made it so that
* PMTU information is not accepted, but fragmentation is allowed
@@ -373,8 +374,11 @@
# else
int action = IP_PMTUDISC_DONT;
# endif
+blahblah:
if (setsockopt(s, IPPROTO_IP, IP_MTU_DISCOVER,
&action, (socklen_t)sizeof(action)) < 0) {
+ omit++;
+ if (errno != EINVAL) {
log_err("setsockopt(..., IP_MTU_DISCOVER, "
# if defined(IP_PMTUDISC_OMIT)
"IP_PMTUDISC_OMIT"
@@ -391,6 +395,11 @@
*noproto = 0;
*inuse = 0;
return -1;
+ }}
+ if (omit == 1) {
+ omit++;
+ action = IP_PMTUDISC_DONT;
+ goto blahblah;
}
# elif defined(IP_DONTFRAG)
int off = 0;
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