On Mon, 06 Nov 2000, Andi Kleen wrote:
> On Mon, Nov 06, 2000 at 11:02:47AM +0000, Alan Cox wrote:
> > > with the TCP ECN_ECHO and CWR flags set, to indicate
> > > ECN-capability, then the sender should send its second
> > > SYN packet without these flags set. This is because
> >
> > Now that is nice. The end user perceived effect is that folks with faulty
> > firewalls have horrible slow web sites with a 3 or 4 second wait for each
> > page. The perfect incentive. If only someone could do the same to path mtu
> > discovery incompetents.
>
> And it penalizes good guys.
> If the host cannot answer to the first SYN for some legitimate reason
> then it'll never be able to use ECN.
It could be a good idea to retry as normal with ECN set; iff that fails
(so the user would normally see an error connecting) try again with
ECN clear. This way, ECN-capable hosts will only see non-ECN
connections under circumstances where the connection would
otherwise have failed completely.
James.
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