Comment # 4
on bug 12597
from Jeff Morriss
Just as a side note: this trace also indicates that there's something weird
going on with the source of the frames I listed: it's not setting the IP DF
(Don't Fragment) bit on any of its packets--even the small ones like HB_ACK's.
It would seem that the implementation is not trying to do path MTU discovery.
IIRC there was an ETSI specification that required turning off path MTU
discovery but of course doing so requires setting the path MTU
appropriately--IP fragmentation really shouldn't be used.
All that to say you might want to investigate that host. It's not behaving
well.
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