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 From:  George Bourozikas <george at bourozikas dot net>
 To:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: Fwd: [m0n0wall] site to site problems
 Date:  Sun, 6 Nov 2005 13:46:43 -0500
On Sunday 06 November 2005 01:12, Ron Freidel wrote:
> Don Munyak (don dot munyak at gmail dot com) wrote:
> > <snip>
> > network..ie same comm provider ? I recall reading sometime ago that
> > some ISP's block GRE.
> >
> > I searched the list for ISP Block Ipsec, yielded similar issues.
> >
> > Just a thought
>
> </snip>
>
> I have thought of that, and to answer your question the one that
> worked was from a cable modem to a dsl modem, if anyone would have
> blocked anything it would have been the dsl provider, everythings
> open with the cable system. The wireless provider I am not sure
> about.

With some help, I was able to get my IPsec tunnels to work by setting 
the WAN MTU to 1400 or so (DSL limit).

--george