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SubjectRe: NCSA telnet doesn't work any more


On Wed, 27 Mar 1996, Alan Cox wrote:

> > I have already posted this in linux-net, but got no single response. Now
> > I have some more data, so I'm posting this once more.
>
> Ok the reason I ignored it is I bin most reports based on certain stacks because
> they are known problem stacks anyway. Notably trumpet v1 and NCSA
>
> > I have found that linux 1.3.74 and 1.3.77 does not work with NCSA telnet for
> > DOS (or rather NCSA telnet doesn't with linux). From NCSA side it looks like
> > the conection is open, but nothing (even login's output) arrives. From the
> > linux side in.telnetd is launched, but nothing more.
>
> Someone said something about NCSA having been fixed. I don't know more about
> it - maybe ask the NCSA people. Also send them this trace too. If they need
> a contact to work out why the two dont talk point them at me.
>
> > 18:08:12.000000 kakofonix.posnet.com.telnet > 1.2.3.88.11134: . ack 16 win 13125 (ttl 64, id 1700)
> > 18:08:12.000000 1.2.3.88.11134 > kakofonix.posnet.com.telnet: . ack 1 win 1024 (ttl 100, id 5)
>
> Up to here looks ok. Note now that we keep sending the remote machine data
> and it is ignoring us after this. That is broken because unless its turned off
> it should either be
>
> a) Sending us an ICMP protocol error if it thinks we are talking garbage
> b) Sending a TCP reject if its lost the connection
> c) Sending a TCP ack frame for at least every other tcp frame regardless of
> whether sequence spaces are right or wrong
>
> > If you have any ideas or need additional information or testing, feel free
> > to write me even at 8 in the morning :-)
>
> Can you try leaving pc/tcp compatibility off and disabling MTU discovery ?
>
> Alan

Ok, I will check it in the moment.....


Jacek



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