[120077] in North American Network Operators' Group
AT&T blocking individual IP addresses
daemon@ATHENA.MIT.EDU (Scott Howard)
Wed Dec 9 10:23:36 2009
Date: Wed, 9 Dec 2009 07:22:50 -0800
From: Scott Howard <scott@doc.net.au>
To: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
As of about an hour ago AT&T appear to have started blocking access to a few
of our IP addresses. This is being done at a /32 level, and the IP addresses
above and below are still allowed through.
Has anyone seen them do this before, or know who I need to contact to get it
fixed? AT&T won't talk to me as I'm not a customer...
Traceroute to the blocked IPs from AT&T all end at :
5 cr2.phlpa.ip.att.net (12.122.3.226) [MPLS: Labels 20559/17406 Exp 0] 116
msec 20 msec 20 msec
6 cr2.cl2oh.ip.att.net (12.122.2.209) [MPLS: Labels 20527/17406 Exp 0] 24
msec 20 msec 20 msec
7 cr1.cl2oh.ip.att.net (12.122.2.125) [MPLS: Labels 0/17406 Exp 0] 24 msec
20 msec 20 msec
8 cr82.dtrmi.ip.att.net (12.123.139.154) [MPLS: Label 16623 Exp 0] 24 msec
20 msec 20 msec
9 gar4.dtrmi.ip.att.net (12.122.102.89) 20 msec 20 msec 20 msec
10 12.87.238.238 [AS 7018] 24 msec 20 msec 24 msec
11 12.87.238.237 [AS 7018] !A * *
Traceroute to the neighboring IP addresses don't go anywhere near the above
path, so it's apparently a blackhole of sorts.
Scott.
