SCO Unix...

[Christopher Wagner]

I thought it might be a Reverse DNS problem, and you were indeed
correct..  The beer goes to you! :)

I can add all of these machines to the host file, but that's a bit
kludgy, is there any way I can have telnetd not bother running a DNS
lookup on each machine on the internal network?

As far as the net config app, it's a console app and the machine has a
host entry for itself..  It's actually gurning the disk, so I don't
think it's timing out on the network.

And so how am I gonna get this beer to ya? :)
- Chris
--
<chrisw at pacaids.com>
IS Administrator - Packaging Aids Corporation
San Rafael, CA
415-454-4868 x116
http://www.pacaids.com/


> -----Original Message-----
> From:	ME [SMTP:dugan at passwall.com]
> Sent:	Tuesday, August 07, 2001 12:42 PM
> To:	'talk at nblug.org'
> Subject:	Re: SCO Unix...
> 
> A guess:
> The telnet daemon is attempting to privide a reverse lookup for the IP
> address that is copnnecting, but a firewall rule, or improperly setup
> DNS-lookup rule is blocking the process. When this happens, the
> request
> for reverselookup may be blocking further connection data from passing
> until the namelookup times out.
> 
> To test this:
> Lookup an IP address of a remote machine from which you have present
> shell access for telnet.
> Add that IP address of that machine that has previously been having
> long 
> waits for connections to the /etc/hosts file with a name
> now try to telnet into the box from that remote machine with the IP
> address just added to the /etc/hosts file. If you *now* get a zippy
> response, then examine your DNS. Maybe you have a bad one, bad
> /etc/resolv.conf poor rules for ourgoing requests for DNS, blocking
> for
> incoming requests. lots of possible things for this...
> 
> There are other items that might be of issue, but I thought I would
> take a
> stab at the most likely. (ex: tcp wrappers settings is not perfect and
> a
> timeout is waiting and blocking.)
> 
> > 2) The Network Config app in SCOAdmin takes around 5 mins everytime
> I
> > open it to read all the network configuration stuff.  Could this be
> > related?
> 
> Yes, this is likely if it is also doing reverse lookup of the IP
> address
> connecting for log files. Also could be an authentication scheme you
> might
> be using. Try the top suggestion first.
> 
> 
> -ME
> 
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>      Systems Department Operating Systems Analyst for the SSU Library