Re: [lwip-users] CHARGEN/TCP freezes

[Mitani Hiroshi]

Hi again.

I tried the latest sources from CVS, but chargen still froze.

BTW, timeouts were processed by sem/mbx timeout on my system.
In this method, if TCP thread stops once, no one processes
timeouts and therefore TCP timers stop too.
So, I wrote a cyclic-handler which processes timeouts.

Lwip enters TCP retransmit-mode when two ACKs which have same
ack number are received.

 chargen client > chargen address@hidden: ack=1000
chargen address@hidden > chargen client: seq=1000
chargen address@hidden > chargen client: seq=1100
 chargen client > chargen address@hidden: ack=1200
chargen address@hidden > chargen client: seq=1200
chargen address@hidden > chargen client: seq=1300
 chargen client > chargen address@hidden: ack=1200 <- same ack no./bigger win 
size.
chargen address@hidden > chargen client: seq=1200
chargen address@hidden > chargen client: seq=1200
chargen address@hidden > chargen client: seq=1200
chargen address@hidden > chargen client: seq=1200
chargen address@hidden > chargen client: seq=1200
...
<< entering exponential back-off >>

I think that a client is waiting for next sequence in order
to avoid the SWS. Is this correct?
If so, why Lwip does not send next sequence?
--
mitani

I wrote:
> Hi
>
> It is 1.1.0 release.
>
> tcp.c       12-07-2004
> tcp_in.c    11-24-2004
> tcp_out.c   12-27-2004
>
> Should I try newer version?
> --
> mitani
>
> Leon Woestenberg wrote:
>
> > Hello,
> >
> > Mitani Hiroshi wrote:
> >
> > > Hi
> > >
> > > I am trying to run 'chargen.c'. But it always freezes in a while.
> > > It seems that TCP stops sending packet with two ACKs which have
> > > same ack number. Here is the last part of dump list by tcpdump.
> > >
> > >
> > > Does anybody have a hint for me?
> > >  
> > Which version of lwIP? From CVS, or from a release?
> >
> > Regards,
> >
> > Leon.
> >
> >
> > _______________________________________________
> > lwip-users mailing list
> > address@hidden
> > http://lists.nongnu.org/mailman/listinfo/lwip-users
>
>
>
>
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