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Index: sys/netinet/tcp_timer.c
===================================================================
--- sys/netinet/tcp_timer.c
+++ sys/netinet/tcp_timer.c
@@ -679,11 +679,16 @@
* - Reduce MTU to lower value than what we
* negotiated with peer.
*/
- /* Record that we may have found a black hole. */
- tp->t_flags2 |= TF2_PLPMTU_BLACKHOLE;
+ if ((tp->t_flags2 & TF2_PLPMTU_BLACKHOLE) == 0) {
+ /*
+ * Record that we may have found a black
+ * hole.
+ */
+ tp->t_flags2 |= TF2_PLPMTU_BLACKHOLE;
- /* Keep track of previous MSS. */
- tp->t_pmtud_saved_maxseg = tp->t_maxseg;
+ /* Keep track of previous MSS. */
+ tp->t_pmtud_saved_maxseg = tp->t_maxseg;
+ }
/*
* Reduce the MSS to blackhole value or to the default

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