[RndTbl] Shaw packet loss
athompso at athompso.net
Tue Oct 19 11:17:33 CDT 2010
If MTR shows loss at hop 1 but *not* at hop 2, that's just their router ignoring your ICMP packets and doesn't actually indicate packet loss.
*sigh* I can't believe I'm defending Shaw...
From: John Lange <john at johnlange.ca>
Sender: roundtable-bounces at muug.mb.ca
Date: Tue, 19 Oct 2010 11:14:16
To: Continuation of Round Table discussion<roundtable at muug.mb.ca>
Reply-To: Continuation of Round Table discussion <roundtable at muug.mb.ca>
Subject: Re: [RndTbl] Shaw packet loss
Just for reference; I use mtr for testing this.
Here is the command line. As you can see, I've set a very aggressive
packet rate (20/second).
# mtr -r -w -c 500 -n -i 0.05 www.google.ca
I actually stick it in a loop so I can keep it running and see periodic results:
# while true ; do date ; mtr -r -w -c 500 -n -i 0.05 www.google.ca ; done
When I see loss, it's always at the first hop yet it doesn't seem to
matter which gateway it is. These are all Shaw business customers so
may not be affecting residential.
On Tue, Oct 19, 2010 at 10:57 AM, Mike Pfaiffer <high.res.mike at gmail.com> wrote:
> On 10-10-19 10:39 AM, Sean Walberg wrote:
>> On Tue, Oct 19, 2010 at 10:36 AM, Mike Pfaiffer<high.res.mike at gmail.com>wrote:
>>> Then there is their policy of slowing down the entire connection if
>>> they determine someone is using bittorrent on a LAN (even if the user
>>> caps the up and down speeds)
>> Do you have a source for this? Are you sure it's not because you're starving
>> out your upstream and therefore not able to get ACKs out?
> Give it a try. Grab a movie or something. Use a bittorrent client
> capable of capping the up and down speed. Ktorrent can do this. See what
> you can get for both up and down uncapped. Then try running say Firefox
> and look at its performance. Stop the bittorrent transfer and look at
> Firefox again in a few minutes. Set up a cap in bittorrent say 10K on
> both the up and down (bear in mind this is supposed to be a
> multi-megabit connection). Restart your bittorrent and see what happens
> with Firefox. You'll notice the bittorrent will transfer to what ever
> maximum you set while other programs will barely function on the
> internet. Local transfers on the LAN are fine though.
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