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Date:      Sat, 01 Jul 2000 11:47:06 +1200
From:      Mark Ibell <marki@paradise.net.nz>
To:        "Sean O'Connell" <sean@stat.Duke.EDU>, freebsd-bugs@freebsd.org, freebsd-stable@freebsd.org
Subject:   Re: telnet/tcp problems in 4.0-RELEASE
Message-ID:  <395D317A.D56E2AC@paradise.net.nz>
References:  <395C9767.3CB72C03@paradise.net.nz> <20000630094706.F48683@stat.Duke.EDU>

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Sean O'Connell wrote:
> 
> Mark Ibell stated:
> : Hi,
> :
> : We have a FreeBSD 4.0-RELEASE (GENERIC kernel) box at work that has
> : exhibitted some strange telnetd behaviour. For example, when you try to
> : telnet in you get a login prompt straight away but after entering a
> : password have to wait for exactly 150 seconds (2m30s) until the shell
> : prompt is reached.
> :
> : Even more curiously, once logged in if you try to telnet (or ftp for
> : that matter) out, a 75 second delay is experienced. This has happened a
> : couple of times now and a reboot fixes the problem. DNS has been checked
> : carefully (nslookup queries work fine), so I'm pretty sure it's not
> : that.
> :
> : I've seen a couple of vague references to this problem but nothing quite
> : so clearly defined. There is no problem on boot, so I can only guess the
> : system gets itself into a state over time.
> :
> : Guess I'd better upgrade to 4.0-STABLE...
> 
> Yep.  Going to stable is a good idea.   If you aren't using IPv6,
> you might want to pull that out of your kernel config
> 
> #option INET6
> #pseudo-device gif
> #pseudo-device faith
> 
> there were some issues with gethostbyname and ip4to6 in RELEASE.

hmmm - I might try that.

> 
> This sounds like a dns problem though.  Do reverse look ups
> work?  Telnet usually does a forward and a reverse lookup.  Also,
> make sure that this isn't an autonegotiation (speed and duplex) error
> on the NIC.

yep - forward and reverse lookups work for all machines involved.

I don't think that it's a NIC negotiation problem either because
ftp/http into the machine work fine. Curiously, even telnet localhost
experiences the same delay!

Thanks,
Mark

> 
> Good luck,
> S
> -----------------------------------------------------------------------
> Sean O'Connell                                Email: sean@stat.Duke.EDU
> Institute of Statistics and Decision Sciences Phone: (919) 684-5419
> Duke University                               Fax:   (919) 684-8594




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