telnet delays

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From: "Brian K. White" <brian@aljex.com>
References: <988670088.294816@monster.nlc.net.au> <3AEE0F21.7F5A7353@idealgroup.com> <988684627.17645@monster.nlc.net.au> 
Subject: Re: Can anyone tell me what's causiing these delays
Date: Tue, 01 May 2001 04:13:35 GMT


"Greg Hines" <greghines@bigfoot.com.NOSPAM> wrote in message
news:988684627.17645@monster.nlc.net.au...
> Darryl,
>
> I somehow do not think so.  I would have expected any sort of name/ip
> problem to be consistent and not when you only do an RSH command
immediately
> after another.
>
> Also the problem exists when you use the IP address in the RSH command.
>
> Any other ideas would be helpful.

well you are right that the delay he's talking about affects other things
(telnet, ftp, etc...) and that it would affect the first attempt and not
just the second. But on the subject of using an IP instead of hostname, that
does not get around the delay Darrel was referring to.

That delay happens any time you try to connect to the sco box, via any of
several protocols, if the sco box has anything at all in /etc/resolv.conf,
and if the IP/hostname you are trying to connect *from* is not resolvable by
the unix box, from the unix box. This means that if the unix box has any
nameservers defined in resolv.conf, and if the ip you are connecting from is
not known to those dns servers (such as all your local, non-routable IP's)
then you will get a delay when trying to connect unless the IP is listed in
/etc/hosts, even if the hostname used in /etc/hosts is bogus, so long as the
IP is listed. IE:
10.0.0.22 dummy22
10.0.0.23 dummy23
10.0.0.24 dummy24

Even though we've established a few reasons why this is probably not the
cause of your delay, it's easy to do, and harmless, and easy to undo (no
reboot, no restarting tcp/ip, effects are immediate) so it's worth trying if
only to find out another thing that it's *not*.

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