[78586] in North American Network Operators' Group
Re: US Navy Contact.
daemon@ATHENA.MIT.EDU (Todd Vierling)
Fri Mar 11 11:12:12 2005
Date: Fri, 11 Mar 2005 11:11:15 -0500 (EST)
From: Todd Vierling <tv@duh.org>
To: Michael.Dillon@radianz.com
Cc: nanog@merit.edu
In-Reply-To: <OFCE675DF0.02D4406A-ON80256FC0.00385C96-80256FC0.0038D979@radianz.com>
Errors-To: owner-nanog@merit.edu
On Thu, 10 Mar 2005 Michael.Dillon@radianz.com wrote:
> > One of our
> > netblocks appears to be filtered somewhere inside their network,
> > preventing DNS lookups from completing, thus preventing e-mail from
> > being delivered.
>
> Am I reading this correctly? You are saying that you
> have engineered a single point of failure in your network
> and now you are suffering as a result?
From how I read it, the original poster did not have a network failure, but
rather is being afflicted by deliberate packet filtering. That is *not* a
SPOF effect.
Sure, multiple diverse nameservers are preferable, but even that will never
prevent blanket blocking from causing filures at some remote site.
--
-- Todd Vierling <tv@duh.org> <tv@pobox.com>
