[nzlug] Slow uploads to Trademe

[Matt Brown]

Joel van Velden wrote:
> On Tue, 2006-08-08 at 08:30 +1200, Hadley Rich wrote:
>> On Tuesday 08 August 2006 10:12, cr wrote:
>>> mtu 512 is the answer in my
>>> case).
>> Wow, that's small.
> 
> You could take the scientific approach of changing the MTU between 512
> and 1500 (say in increments of 100) and timing how long it takes to send
> an email with an attachment to yourself or something similar.

And to do this in a nice friendly automated manner you could use the
scamper tool written by Matthew Luckie of the WAND Group at Waikato
University.

Scamper is an advanced traceroute tool that has the ability to probe for
path MTU and discover pMTU blackholes (routers that aren't sending frag
required when they should). You can get it from
http://www.wand.net.nz/scamper/ or if you're lucky enough to be running
Debian you can grab my .deb packages from http://www.mattb.net.nz/debian/

Once you have scamper installed you probably want to run it without a
command like this:

matt at xenon:~$ scamper -m -4 -i 202.21.128.2

There is full documentation on the webpage and scamper has inline help
(--help) and a manpage.

-- 
Matt Brown
matt at mattb.net.nz
Mob +64 21 611 544 www.mattb.net.nz

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