On Fri, Nov 06, 1998 at 08:53:44AM -0800, Steve Shah wrote:
> So to summerize: I'm really talking out of my ass when say I'm trying to
> change the MSS midstream?
Yes :-)
> (AKA Silly Window Syndrome) <sarcasim>So I got this bright idea</sarcasim>
> to to see if I could reduce the MSS midstream to correspond with
> situations when I want to bring the TCP window that low. (This is
> for a experiment.)
Any MSS option you send midstream will be ignored anyway.
It only has meaning in the SYN segments.
You can reduce the MSS midstream by reducing the MTU, provided both ends
do path MTU discovery. Both ends will take a little to adapt to the
fact that their Dont-Fragment segments are getting bounced.
You can't take the MTU any smaller than 576 though, and the one each end
selects usually won't match the MTU exactly.
And don't forget, Linux TCP packetises the outgoing stream when it is
queued; changing the MSS by whatever means probably won't result in an
optimal repacketisation for the queued data.
> Looking at tcpdump and ipgrab, I saw that no one explicitly diallowed
> this. TCP/IP Illustrated never forbided it.
Sure, but everyone will ignore your non-SYN MSS options anyway :-)
-- Jamie
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