AT&T routing issue

Campbell, Alex Alex.Campbell at
Wed Nov 5 03:45:59 UTC 2008

Many thanks to all those who replied.  It did turn out to be a filter
that needed updating at 7018, which was very quickly fixed by their

-----Original Message-----
From: Brian Wallingford [mailto:brian at] 
Sent: Wednesday, 5 November 2008 2:06 PM
To: Charles Gucker
Cc: Campbell, Alex; nanog at
Subject: Re: AT&T routing issue

:In short yes.   AT&T uses a customer specific access list to perform a
:uRPF like function.   That is, if your provider did not request for
:their provider to have AT&T update their filter.

Indeed.  We've used ATT MIS for many years and have been happy with
policies (which have blunted quite a few DDOS attacks), and their
to acl mod requests.  They do tend to take longer than I'd like
(on the order of several business days) for standard requests, though if
you request expedition, response time is impressive.

Overall, thumbs up.

:AT&T MIS Maintenance
:888-613-6330 Prompt-3, 2
:rm-awmis at

Yep.  Always quite responsive.  As with any other vendor, if you feel
person handling the call isn't qualified, escalate.

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