[25837] in North American Network Operators' Group

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Re: should TCPs do MTU black hole detection?

daemon@ATHENA.MIT.EDU (Randy Bush)
Thu Nov 18 21:37:05 1999

From: Randy Bush <randy@psg.com>
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To: Chris Cappuccio <chris@dqc.org>
Cc: Vern Paxson <vern@ee.lbl.gov>, nanog@merit.edu
Message-Id: <E11odtP-0004kL-00@roam.psg.com>
Date: Thu, 18 Nov 1999 21:35:19 -0500
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>> I'm wondering whether the ISP community has a clear preference for either
>> yes-do-detection or no-we-want-the-problems-fixed.
>> Comments appreciated.
> I think that most ISP's would prefer that problems were fixed.

the choice seems 

  o when it breaks, the noc gets the call, debugs it, and it gets fixed

  o when it breaks, the software does successive guesswork back-offs until
    it makes it through.  the performance sucks big-time, the customer
    thinks the isp is at fault, but the noc does not get called and the
    real problem never gets fixed.

randy


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