From: David McWilliams (davidkmcw@yahoo.com)
Date: Tue Aug 17 2004 - 16:03:30 EDT
OK... I'm getting it... Apparently they worked OK before as Solaris 8,
but now they are Solaris 9, it doesn't. The end user is telnetting from
a laptop within a workgroup, so no WINS, Windows DDNS, etc. Is there a
way to disable the RDNS lookup? The end user is transitioning to ssh
but has a few shell scripts that are no longer functioning.
Thanks in advance,
David
--- John Christian <john.christian@TheCReGroup.com> wrote:
> Hi David,
>
> telnetd is trying to do a reverse DNS lookup on the incoming IP
> address of your source host. Although not having a reverse DNS entry
> doesn't break the telnet attempt altogether, it does add 10-30
> seconds of wait time while the reverse DNS attempt times-out and
> fails. Adding your source host and IP into the /etc/hosts file
> satisfies telnetd's curiosity of the IP's hostname which makes for
> faster connections.
>
> Since most shops don't keep reverse records for every PC and laptop
> in the company (and you probably don't want to keep updating the
> /etc/hosts file) you may want to look into the DNS configuration at
> your site. Instead of a reverse lookup request timing out (the 10-30
> second wait) it *should* fail instantly if the information is not
> available.
>
> This is more of a DNS configuration issue to explore. Properly
> configured DNS will either quickly provide an answer OR quickly tell
> you it's a failed lookup. I see a lot of shops where DNS either
> quickly provides an answer OR takes a while and eventually times out
> for failed lookups.
>
> -John Christian
>
>
> ________________________________
>
> From: sunmanagers-bounces@sunmanagers.org on behalf of David
> McWilliams
> Sent: Tue 8/17/2004 3:24 PM
> To: sunlist
> Subject: Slow telnet response
>
>
>
> I have a couple of Sun machines @ Solaris 9 that respond very slowly
> to
> telnet. If I put the hostname & IP address of the machine I am
> telnetting from into the local hosts file it is almost instantaneous.
>
> These machines were built by a former colleague.
>
> Any ideas?
>
> David
>
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