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 From:  George Bourozikas <george at bourozikas dot net>
 To:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] IPSEC Problems
 Date:  Thu, 26 May 2005 09:26:55 -0400
On Thursday 26 May 2005 09:09, James F. Newberry wrote:
> I've been trying to get IPSEC between 2 m0n0wall boxes working for
> about a week now.  I have read alot of the past posts and still have
> no luck. I've tried it over the internet and also locally.  I've
> tried, aggressive, main, ....  many different settings.  I setup a
> third box and still no luck.  I've checked the system time and that
> is ok.  The log tells me it can not establish phase 1.  Is there some
> setting I'm missing that is not under the ipsec section?
>
> Thanks for any ideas

I had the same problem and fixed it by changing the MTU on my machines 
to 1400.  This seems to be necessary if one or both of your pipes is 
DSL-based.

--george