Grant wrote:
>All of a sudden tonight my web browsing and ssh performance is
>terrible. I'm on a cable connection and I'm wondering if it could be
>due to evening bandwidth contention or ISP throttling. If so, I
>suppose tcdevices numbers are out the window. Can anything be done?
First thing you can do is look at your TC numbers and see where the
packets are queuing up - if your TC isn't throttling it, then it must
be external.
As I wrote in another thread ("Traffic Shaping Newbie", 20th Jan),
unless you have a guaranteed minimum bandwidth then you have to
compromise. If you configure your TC when there is no contention (in
the local cable network, or in the ISPs backhaul) then it will fail
to function once contention kicks in and your available bandwidth
drops. All you can do is compromise :
Reduce your inbound and outbound rates to allow for the contention.
The downside is that unless you throttle yourself down to the worst
case situation, then you are still going to have periods where your
tc doesn't work properly. And any reduction in rates you specify will
restrict you for the other 22 hours of the day.
Over here in the UK, ADSL used to be sold on contention ratio but
virtually all ISPs have dropped that and no longer mention it.
Typical for home use was 50:1, so a 2Mbps ADSL service could cut you
down to just 41kbps ! Not many people realise this, and I think the
best way to deal with some of the complaints would be to force the
ISPs to quote minimum rates (aka CIR, Committed Information Rate)
which is common in business environments - but that's another thread !
So if you had such a 50:1 2M service, to guarantee effectiveness of
your tc, you would need to set your inbound rate to just under 41kbps.
In the real world, the other 49 won't be using there 2M all the time
- that's why the ISPs can (or at least could) get away with it. Now
torrenting and watching video is so common, more people are using
more bandwidth for more of the time and congestion in the backhaul
(or local segment in cable networks) is more of a problem.
--
Simon Hobson
Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.
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