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 From:  Vincent Fleuranceau <vincent at bikost dot com>
 To:  John <strgout at unixjunkie dot com>
 Cc:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] IPSec nightmare !!!
 Date:  Thu, 13 Jan 2005 23:51:47 +0100
>>Hello all,
>>I've established IPSec tunel between remote, and central office.
>>Simple question: Ping from central office to remote office works in
>>both directions, but no other data flows. I've tried ping with bigger
>>packets (600 - 1200 byte) not working. When I use dummy windows
>>machine to connect to remote office ISP everything works great. Please
>>help me! Routing is OK, which is not a problem! Is it a problem with
>>MTU value or....


Did you try to allow fragmented packets (LAN default pass rule)?

FYI: I had the same problem but it "disappeared" when I switched to 
version 1.2b3 (or 1.2b2 I can't remember)...

-- Vincent