News Group Posts

ping and telnet

Newsgroups: comp.unix.sco.misc
From: Bela Lubkin <belal@sco.com>
Subject: Re: SCO and ping/telnet
Cc: bmcgrady@netzero.net
Date: Tue, 2 Oct 2001 10:18:00 GMT
Message-ID: <20011002031800.L5148@mammoth.ca.sco.com> 

Barry L. McGrady wrote:

> We have just "inherited" a couple of SCO boxes running on a
> large network.  I noticed a weird thing going on that I can't
> explain... on both boxes (located on different subnets) I can
> telnet to devices on different subnets, but not ping them.
>  I realize that these 2 commands operate at different levels,
> but can't understand why I wouldn't be able to ping these remote
> devices.  Each SCO box has a default gateway setup, pointing to
> the local Cisco router... same as Windows based workstations at
> these sites.  The Windows based workstations can ping across
> subnets just fine... only these 2 SCO boxes can't.
>
> Any ideas where we should begin to look?

I would look for a problem in reverse DNS lookups.  Start by trying the
"-n" flag in your ping attempts.  If that fixes it, the problem is that
ping is getting hung up trying to translate the IP addresses of received
replies back into host names.

If you let the ping run for a long time, DNS will eventually time out
and you'll see one reply.  I assume you are otherwise interrupting the
ping attempts.  If you look closely, you should also notice that ping
says something about having received 1 reply in its final summary, even
though you never see the reply itself.

In OpenServer 5.0.6, ping gives better feedback on this sort of
situation.

>Bela<
 

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