North American Network Operators Group
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Re: Traffic Shape or Rate Limit

  • From: Joe Abley
  • Date: Tue Oct 02 13:03:02 2001 
On Tue, Oct 02, 2001 at 12:51:39PM -0400, Deepak Jain wrote:
> Everything drops packets if you fill the buffers...
> 
> Rate limiting vs Traffic Shaping is about intent and QoS in my experience.

There are some devices that attempt to control traffic without
filling buffers, such as the PacketShaper range of products by
Packeteer. The PacketShapers control performance of individual
TCP sessions by modifying the window size advertisements in flight
to simulate reactions to congestion conditions.

I have used PacketShapers before. They can be very capable and
useful boxes if matched to appropriate traffic/flow volumes (and
if the applications responsible for the traffic being shaped are
tolerant of the layering violations that the boxes engage in).


Joe