From owner-freebsd-questions  Thu Apr 25  3:12:16 2002
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Date: Thu, 25 Apr 2002 11:10:35 +0100 (BST)
From: Jan Grant <Jan.Grant@bristol.ac.uk>
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To: "Kevin Kinsey, DaleCo, S.P." <kdk@daleco.biz>
Cc: questions <questions@FreeBSD.ORG>
Subject: Re: DNS port Number, Protocol
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On Wed, 24 Apr 2002, Kevin Kinsey, DaleCo, S.P. wrote:

> Thanks, I'll look into it, but everybody except
> AT&T says my DNS is "jolly good".  (Pardon the
> dumb Yank for throwing that at 'ya.)  The specific problem is that "email"
> from my cellphone to daleco.biz
> returns undeliverable, immediately.
>
> The latest theory is that AT&T wireless does a
> ping to determine whether or not a domain exists,
> and since I've got that blocked, they write me
> off their own lists......"never a dull moment," I
> guess.

This is an aside, but by blocking ping you're going to cause yourself
more heartache than help. ICMP is required for IP to operate properly;
at the least, you're removing a vital network diagnosis tool.

-- 
jan grant, ILRT, University of Bristol. http://www.ilrt.bris.ac.uk/
Tel +44(0)117 9287088 Fax +44 (0)117 9287112 RFC822 jan.grant@bris.ac.uk
Talk is cheap: free, as in beer. As in Real Ale, not that Budweiser rubbish.


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