Networking Troubles

[Kareem Shehata]

> -----Original Message-----
> From: owner-tlug-lxSQFCZeNF4 at public.gmane.org [mailto:owner-tlug-lxSQFCZeNF4 at public.gmane.org] On Behalf Of William
> O'Higgins Witteman
> Sent: Thursday 13 September 2007 22:11
> To: tlug
> Subject: [TLUG]: Networking Troubles
> 
> I have set up my first new computer in many years, and happily installed
> Debian on it, but I am having a couple of niggling wee problems with
> it, and could use a pointer or two.
> 
> The first problem is a lag in outbound networking - only on DNS queries
> - pinging an IP gets instant responses, but any DNS resolved ping seems
> to be waiting for a timeout.  I thought I fixed this once before, but it
> has been years since I installed fresh, so I forgot this fix.
> 
> The second problem is that I cannot seem to reach my SMTP smarthost
> (teksavvy) with Postfix.  The configurations are the same between this
> box (working) and the new box (not working).
> 
> Here's a snippet from /var/log/mail.log:
> 
> Sep 13 15:12:20 yam postfix/smtp[7338]: 7DA639F4B0:
> to=<address-hcDgGtZH8xNBDgjK7y7TUQ at public.gmane.org>, relay=none, delay=20, delays=0.05/0.02/20/0,
> dsn=4.4.3, status=deferred (Host or domain name not found. Name service
> error for name=smtp.teksavvy.com type=MX: Host not found, try again)
> 
> I can ping the address, so something else is awry.  Any help would be
> appreciated, thanks.

Sounds like a resolv.conf type problem, that's the first place I would
check.  Can you post the contents of that file?  Also, is your network
interface automatically configured (DHCP) or done manually?

Lastly, with your postfix error, do you have any entries in the hosts file?
I don't know much about postfix, but I've seen some mailers that won't use
the hosts entries and run exclusively off DNS.

-kms


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