Re: tcp/ip bug (2.2.12) or telnet client bug

Dave Airlie (airlied@csn.ul.ie)
Mon, 27 Sep 1999 18:38:00 +0100 (IST)

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> > > I insist, there is no daemon listening on
the specified port.
> > > Anything i type in is simply echo'd.
>
> Confirmed that version 2.3.13 has that bug also.

On 2.2.12 the attached C code works to demonstrate the problem, compile
the code to a binary stest

To use it first of all run tcpdump -i lo to snoop your localhost interface
then, do
./stest <anyport with no listener>

Then do look at the tcpdump window and see socket the system is trying to
use, take this number increase it by one and then run

./stest <number+1>

This should connect now ...

e.g.

./stest 9600

tcpdump gives
18:35:21.211797 localhost.9600 > localhost.1315: R 0:0(0) ack 1 win 0

so do ./stest 1316 and it connects...

this is not meant to happen as far as I know ...

Dave.
>

------------ David Airlie, David.Airlie@ul.ie,airlied@skynet --------
Telecommunications Research Centre, ECE Dept, University of Limerick \
http://www.csn.ul.ie/~airlied -- Telecommunications Researcher \
--- TEL: +353-61-202695 -----------------------------------------------

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