SITE A communicate correctly with SITE C and of course SITE C to SITE A
SITE B communicate correctly with SITE A and of course SITE A to SITE B
SITE B and SITE C have issues i can ping everything in the 2 lans
from lan of SITE B to lan of SITE C and viceversa
but all protocols have issues
it seems that only very small packets do work between SITE B and SITE C
(and viceversa)
e.g. if a copy from a folder a very small file (e.g. 1KiloByte file) from
SITE C to SITE B it works
if i copy a bigger file it does not work and it seems to wait forever
in the past SITE B to SITE C and vice versa communications worked correctly
both SITE B and SITE C (like also SITE A) use MD5 as auth header
and 3DES as encrpytion, ip compression DEFLATE
preshared secret and client-Xauth
i've of course tried to disable compression, but nothing changes/no improvement
i'm running out of idea
it seems like an MTU issue
the 2 FW machines runs eCS2.2b and have MTU 1500 on the WAN and lan NIC
and that's the right MTU as also suggested by the ISP
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