Re: Window shrinking (was Linux v2.6.16-rc6)

2006-04-12 Thread Andy Furniss
Roberto Nibali wrote: I had the distinct pleasure of partly get involved with debugging network stalls related to Linux clients (2.6.x kernel) and a Packeteer. Dare I suggest that it could be something as trivial as it looks like window scaling defaults to off on SunOS 2.5.1 and it's on on

Re: Window shrinking (was Linux v2.6.16-rc6)

2006-04-12 Thread Roberto Nibali
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 "

Re: Window shrinking (was Linux v2.6.16-rc6)

2006-04-10 Thread Mark Butler
Andy Furniss wrote: Mark Butler wrote: 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

Re: Window shrinking (was Linux v2.6.16-rc6)

2006-04-10 Thread Andy Furniss
Mark Butler wrote: 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 revokin

Re: Window shrinking (was Linux v2.6.16-rc6)

2006-04-10 Thread Mark Butler
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

Re: Window shrinking (was Linux v2.6.16-rc6)

2006-04-10 Thread Andy Furniss
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

Re: Window shrinking (was Linux v2.6.16-rc6)

2006-04-09 Thread Mark Butler
Andy Furniss wrote: David S. Miller wrote: From: "Michal Piotrowski" <[EMAIL PROTECTED]> Date: Sun, 12 Mar 2006 02:51:40 +0100 I have noticed this warnings TCP: Treason uncloaked! Peer 82.113.55.2:11759/50967 shrinks window 148470938:148470943. Repaired. TCP: Treason uncloaked! Peer 82.113.5