[ns] Re: reset() in tcp.cc, Question on getting pointer to sink from tcp client

[Eric Weigle <ehw@lanl.gov>]

Hi everyone-

What I want to do is add some code tcp.cc to get a pointer to the sink class
it's working with, so that I can call reset() on the sink class when tcp gets
reset(). More generally, how can one end of connection find the other end of a
connection? The motivation and more detail for this is as follows:

A while back Nabil Seddigh asked why
> reset() in tcp.cc doesn't currently set the following
> parameters to zero:
> 
> ndatapack_
> ndatabytes_
> nrexmitbytes_
> nrexmit_
And I couldn't find a response. Any comment? This applies indirectly to what I'm
doing.

For me, I'm re-using tcp clients for some of my experiments and I observe the
following behavior (Tracing tcp.cc newack() routine, where last_ack_ is set)
...
call 1 to newack(): last_ack_: 72, highest_ack_: 71
(reset gets called)
call 2 to newack(): last_ack_: 73, highest_ack_: -1
call 3 to newack(): last_ack_: 74, highest_ack_: 73
...

What's happening (I think) is that since the connection's sink is NOT getting
reset when I call reset in tcp; the next ack I get holds a number from the
previous connection; which then overrides the local ack counts.

Thanks for any information, I know my explanation of the problem may be a bit
unclear.
-Eric

--------------------------------------------
 Eric H. Weigle   CCS-1, RADIANT team
 ehw@lanl.gov     Los Alamos National Lab
 (505) 665-4937   http://home.lanl.gov/ehw/
--------------------------------------------