[105994] in North American Network Operators' Group
Re: Avg. Packet Size - Again?
daemon@ATHENA.MIT.EDU (Fred Baker)
Wed Jul 16 11:25:15 2008
From: Fred Baker <fred@cisco.com>
To: Randy Bush <randy@psg.com>
In-Reply-To: <487DDEBF.2080106@psg.com>
Date: Wed, 16 Jul 2008 08:24:59 -0700
Cc: nanog <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
CAIDA has been doing a lot of that, at least in the past. Last I asked
them, which was quite a while back, they said that O(35%) of traffic
in their samples was at the path MTU (which included 576 bytes for
historical reasons), O(40%) was about the size of a TCP SYN or ACK,
for reasons that are apparent if you think about common TCP
implementations, and sizes were scattered more or less uniformly in
between - last packet in a burst or transaction exchanges. From the
numbers that Valdis posted the other day, it sounds like the logic
remains about the same but the relevance of "576" has largely gone away.
On Jul 16, 2008, at 4:42 AM, Randy Bush wrote:
>> Our network also shows peaks at the ethernet MTU (our MTU is higher
>> than that) and the DNS packet size.
>
> so who has been tracking packet size distributions for some years and
> has published or could provide data?
>
> randy
>
>
>
