pmtu discovery on SA ESP

["Marco Berizzi" <pupilla@xxxxxxxxxxx>]

Hello. I have upgraded my linux kernel from 2.4.32 with Openswan KLIPS to 
2.6.14.3 with
NETKEY and now I seeing this kind of messages:

pmtu discovery on SA ESP/787e5268/50ccebfe
pmtu discovery on SA ESP/2a6e319d/50ccebfe
pmtu discovery on SA ESP/2a6e319d/50ccebfe
pmtu discovery on SA ESP/2a6e319d/50ccebfe

What are these?

TIA


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