[2590] in linux-net channel archive
in.rlogind stuffing up
daemon@ATHENA.MIT.EDU (Doug Ledford)
Fri Apr 19 04:17:13 1996
Date: Fri, 19 Apr 1996 03:06:30 -0500 (CDT)
From: Doug Ledford <dledford@dialnet.net>
To: Linux-Net <linux-net@vger.rutgers.edu>
I was wondering if anyone out there knew how to fix my particular
problem. I have a modem server. When people dial into this server they
can either start PPP using PAP, or they can do a standard character
login. If they do the character login, they get prompted with a
restricted shell program giving them one of two choices. One is to start
ppp (this is for avoiding the headaches of people who can't do PAP or for
people that need custom ppp setups which need to be know before ppp is
called, hence, they can't use PAP since it logs them in as well) or they
have the option of connecting to our shell server. This is done by
performing an rlogin -8 -E shell. Now, for the problem. This works fine
most of the time. But, if a modem disconnects unexpectedly, it can leave
the in.rlogind on shell in a waiting state. In this case, if I check a
netstat -a on shell, I will usually find a single tcp connection on the
rlogin port that has a large amount of information in the transmit and
recieve queue, but no process on the remote machine is listening. In
this case, further rlogins from the modem server fail to connect with a
"connection refused" error message. As soon as I kill the offending
in.rlogind, everything starts working again. I was wondering why, when
the remote in.rlogind is sending packets to a no-longer valid port on the
modem server, is the modem server not sending a tcp reset thereby causing
the conenction to be dropped on shell and the program to terminate and
things to work OK. If anyone has any ideas as to why this might be
happening, or how to fix it, please let me know :)
Thanks
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