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From: brian@shift.lan.awfulhak.org (Brian Somers)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: 2.2-RELEASE + PLIP = problem
Date: 20 Mar 1997 13:59:02 GMT
Organization: Awfulhak Ltd.
Lines: 45
Message-ID: <5grfr6$bip@ui-gate.utell.co.uk>
References: <5gm6f1$ukc@hecate.umd.edu> <5gmguh$icd@ui-gate.utell.co.uk>
<5goto1$20g@hecate.umd.edu>
Reply-To: brian@awfulhak.demon.co.uk, brian@utell.co.uk
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In article <5goto1$20g@hecate.umd.edu>,
marat@Glue.umd.edu (Marat Fayzullin) writes:
> Brian Somers (brian@shift.lan.awfulhak.org) wrote:
>: The only thing I can suggest is using the -link0 option.... but I
>: don't expect it will help.
> It didn't: link0 is turned off by default :(
>
>: The only time I've seen a similar thing is with bad ip checksums -
>: some OSs are lazy and ignore the IP sum for speed, but FreeBSD
>: has always (and still does in 2.2) dropped packets with bad sums.
> I appear to be getting an opposite problem: all FreeBSD machines
> respond, but neither AIX nor router do.
>
>: What about pinging the laptop from the AIX box ? Try doing this
>: while running tcpdump on the lan interface on the FreeBSD gateway
>: (the one with the plip connection to the laptop). Do you see
>: the ping getting to the interface and the response coming back ?
> After adding an explicit route at the AIX box (route add laptop gateway)
> I was able to telnet back and forth between AIX and the laptop.
> Nevertheless, doing the same on the router only produced a one-way effect:
> I can telnet from the router to the laptop, but not the vice versa: the
> router still doesn't answer. I.e. adding routes fixes things somewhat, but
> it doesn't appear to have anything to do with the problem :(
>
> It is possible that I am doing something terribly wrong when establishing
> the link. Could somebody explain what exactly has to be done on the laptop
> and the gateway in order to establish PLIP connection correctly?
If telnet from the router to the laptop works, it means packets can
travel both ways. Try attempting a telnet from the laptop to the
router and waiting for a long time. It may be the case that the
router can't resolve the laptops IP number - this will cause a telnet
connection to do something like:
Connected to router
Escape character is '^]'.
[long pause]
while telnetd tries to reverse lookup the connecting IP number. Is
there any way of doing nslookups on the router ?
--
Brian <brian@awfulhak.demon.co.uk> <brian@freebsd.org>
<http://www.awfulhak.demon.co.uk>
Don't _EVER_ lose your sense of humour !