[45948] in North American Network Operators' Group
Re: Satellite latency
daemon@ATHENA.MIT.EDU (Hank Nussbacher)
Tue Mar 5 01:45:07 2002
Message-Id: <5.1.0.14.2.20020305083917.0101b268@max.att.net.il>
Date: Tue, 05 Mar 2002 08:42:22 +0200
To: nanog@merit.edu
From: Hank Nussbacher <hank@att.net.il>
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New 12.2(8)T feature in Cisco IOS called TCP Windows Scaling:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t8/tcpwslfn.htm
Specifically made for satellite networks:
ip tcp window-size 750000
-Hank
>On Wed, Feb 27, 2002 at 11:01:04PM -0500, Mark Allman wrote:
> > > The receiver is the one that informs the sender how large of a
> > > window it can accept, so it can be practical for a subscriber
> > > installation. It wouldn't be a good idea to park a bunch of
> > > servers behind one of these links, but any receiving node that set
> > > its TCP receive window to 2x the byte/sec capacity of the link
> > > should see decent throughput.
> >
> > No, you need to set things on both sides. The sender has to buffer
> > data until it is ACKed in case it needs to retransmit. So, its
> > buffer needs to be as big as the advertised window or the sender
> > buffer will effectivly limit the advertised window.
>
>What do you need to set on the send side? If the receiver tells the
>sender "my acceptable window is 512k", the sender knows how much it
>has to buffer.
>
>-c
