Re: TCP header bits set in reserved space

From: Alan Cox (alan@lxorguk.ukuu.org.uk)
Date: Thu Nov 30 2000 - 11:05:54 EST


> I can't seem to find this mentioned anywhere. My 2.4 machine
> sets 2 bits in the TCP header between the 4 data offset bits and control
> flags. Like so:

ECN

> can see from one that is are these two bits. RFC793 says they must be zero.
> Is 793 still current? Has anyone else seen this?

793 is still current but remember bits of it are superceded by a couple of
thousand other documents.

Alan

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