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Re: [RRG] Re: [RAM] Tunneling overheads and fragmentation

Dino Farinacci <dino@cisco.com> Tue, 11 September 2007 21:41 UTC

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From: Dino Farinacci <dino@cisco.com>
Subject: Re: [RRG] Re: [RAM] Tunneling overheads and fragmentation
Date: Tue, 11 Sep 2007 14:41:31 -0700
To: Iljitsch van Beijnum <iljitsch@muada.com>
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> Granted, this is a fairly old box in a small network, but I don't  
> see anyone seriously claiming that ALL ISP networks support packets  
> larger than 1500 bytes on ALL their internal links (and also on  
> inter-ISP links).

I did a survey about a month ago and it is true. I will yield to  
those folks who responded to me to protect their privacy. ;-)

But the main gist was:

o We are going to 9K MTUs on all our internal links.
o Where we don't have 9K MTUs, we use 4470.
o Virtually no one runs ISP links at 1500.

Dino

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