Andy Furniss wrote:
Mark Butler wrote:
There is no problem manipulating the TCP window per se. The problem
is advertising a window and then shrinking it faster than it is
naturally reduced by incoming data, essentially granting credit to
transmit x bytes, and then revoking that credit. The net result is
the peer transmits data the advertiser said it was going to accept,
and then the advertiser drops it on the floor. RFC793 only has a
SHOULD NOT for this practice, but it is universally condemned
nonetheless.
Thanks Mark, I guess packeteer closes window down properly, I thought
Dave's reply meant that doing that was Treason.
Packeteer is almost certainly being cavalier about the way it reduces
windows. It could be a serious problem, depending on the way it treats
traffic on the return path. The "treason" thing is a joke. It is like
a bank extending you a credit line one day, and revoking it the next.
- Mark B.
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