AT&T Blocking ICMP (was RE: AT&T US Network Slowdown?)

Tue Aug 19 16:19:28 UTC 2003

A call to AT&T Worldnet confirms that AT&T Worldnet service is blocking ICMP in order to deal with an undefined emergency.  Nothing posted on their site, nor any other info is available.  If anyone has info related to this "icmp outage", please advise.  Thanks!
pj

====================================== 
Paul Jasa 
Network Engineer 
======================================

-----Original Message-----
From: Sean Crandall [mailto:sean at megapath.net]
Sent: Tuesday, August 19, 2003 02:12 AM
To: Paul Jasa; nanog at merit.edu
Subject: RE: AT&T US Network Slowdown?
Importance: High

> 
> Dear Nanogers,
> Is anyone aware of a "slowdown" issue throughout the US AT&T 
> network since 8/18 at around 4pm which is causing a lot of 
> internet circuits (including DSL) to be inaccessible and/or 
> appear down from the outside world?  AT&T says this has been 
> escalated to "Level 4" with no ETA and affecting the whole 
> country.  I am seeing this problem in the San Francisco area. 
>  Just wondering if anyone else is experiencing anything that 
> would confirm AT&T's claim, and fishing for more info about 
> the possible cause and ETA.  Thanks!

We are currently seeing the slowdown on our network in San Jose.  Started
about exactly the time frame that you mentioned.  The rest of the country
(oddly) seems unaffected by this at the moment, but San Jose is getting
hammered by something.

Still trying to sort out exactly where it is coming from.

-Sean

Sean P. Crandall
VP Engineering Operations
MegaPath Networks Inc.
Pleasanton, CA  94588
(925) 201-2530