On Mon, Dec 14, 2009 at 11:12 PM, Joe Lagreca <lagr...@gmail.com> wrote:
> I have a T-1 (1.54mb symmetrical) for our data connection.  Whenever
> there is a big download filling the pipe, the inbound voice chops.
>
> When I set the inbound traffic to 1450kb (tested all the way down to
> 1000kb), I got VERY bad results.  Audio was VERY choppy inbound, and
> ping latency to the internal interface of the firewall would jump from
> 1ms to 700ms.
>
> I was told you can't effectively rate limit the inbound traffic,

Wrong.

> so I
> set the inbound bandwidth to 5,000 kb.  The outbound is set to 1450kb.
>  It sounds much better, but I still have chops when a big download is
> initiated.
>

Because of the above excessive limit. You can't do anything once
traffic is on your downstream, but limiting on the download side
delays traffic after it gets to you, causing TCP's congestion control
to slow down the connection, and hence not overfill your downstream.

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