[c-nsp] shaping outbound

Pete Templin petelists at templin.org
Sun Dec 25 08:24:21 EST 2011

On 12/24/11 2:49 PM, Dan Letkeman wrote:

> I'm confused as to when and where it is possible to shape traffic.  I
> have a 50Mbps internet connection from our ISP and I would like to
> shape some of the download traffic using our 2821.
> Any idea on how to go about this?  Or Am I stuck with buying a
> ridiculously expensive packet shaper or something of the sorts?

You might be stuck.

In the grand scheme of things, it's too late: you should shape as the 
traffic enters the bottleneck, and/or police certain classes as desired. 
  Once the traffic arrives on your router, the congestion has occurred, 
and there's not much to be done about it.

UDP/ICMP won't learn from shaping, so they can still overtake the 
internet link if you were to shape outbound to the LAN.  That's where 
the packet shaper appliance would potentially do better: it can throttle 
the upload traffic to influence the download traffic responses.


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