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Re: PPPoE drops
- To: misc_(_at_)_openbsd_(_dot_)_org
- Subject: Re: PPPoE drops
- From: Damian Gerow <dgerow_(_at_)_afflictions_(_dot_)_org>
- Date: Thu, 25 Nov 2004 11:10:19 -0500
- Mail-followup-to: misc_(_at_)_openbsd_(_dot_)_org
Thus spake Jason McIntyre (jasonmcintyre_(_at_)_f2s_(_dot_)_com) [25/11/04 11:07]:
: > ``If your ISP has an FE crossover to Bell Canada, the optimal MTU is 1448.
: > This is because of all the tunnelling and packet overhead that's created
: > -- anything greater than 1448 (actually, it's 1452, but that's on on the
: > 8-byte boundary) will cause some sort of fragmentation in the packet between
: > you and your ISP.''
: anyone know of other scenarios where 1492 does not work?
AFAIK, that's the only one. And it's not that it doesn't work, but that you
run a much smaller risk of having your packets dropped (due to overloaded
hardware), and you go easier on everyone's equipment -- there's no
re-assembly required, so your network traffic uses considerably less CPU
The key here is the FE crossover -- ISPs with ATM crosovers didn't seem to
be affected by this.
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