Re: T/TCP: Syn and RST Cookies

Alan Cox (alan@lxorguk.ukuu.org.uk)
Mon, 13 Apr 1998 21:19:25 +0100 (BST)


> Another point: we could limit the maximal data sized queued with the SYN -
> as long as sizeof(struct open_request) + maxpacketsize <= sizeof(struct sock)
> the situation is not worse than with stock 2.0 without syncookies ;)

The BSD implementation uses a ridiculous 'assume 4K is a good initial window'
scheme, totally invalidating what little credibility is left with the protocol

I found hacking BSD to use 2*MSS was needed to make T/TCP even work on
1200 or 9600 half duplex links

> T/TCP is often nice for small transactions where only a few bytes need
> to be reliably transfered. This check would allow that nicely.

Note T/TCP and UDP have the same number of transactions for the same
reliability level.

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