[107728] in North American Network Operators' Group
RE: NTT/ChinaTelCom troubleshooting
daemon@ATHENA.MIT.EDU (Andrew Staples)
Fri Sep 12 08:31:48 2008
From: "Andrew Staples" <andrews@ltinet.net>
To: <nanog@nanog.org>
In-Reply-To: <DB9EA494D2E5614D842C2BC65C2D172265EE37@mail-ww.vanoppen.com>
Date: Fri, 12 Sep 2008 20:33:10 +0800
Errors-To: nanog-bounces@nanog.org
Many thanks to all the replies and help. There are some star performers
working for NTT, kudos to them for their professionalism and brainpower.
Follow-up question:
We've seen great improvement by testing throughput using
ChinaNetworkCommunications, AS4837. Before we switch service, does anyone
have experience with their network/service/administration?
Thanks,
Andrew
-----Original Message-----
From: Andrew Staples [mailto:andrews@ltinet.net]
Sent: Monday, September 08, 2008 8:33 AM
To: nanog@nanog.org
Subject: NTT/ChinaTelCom troubleshooting
Our connectivity from the US to ChinaTelCom has been in the toilet for 2
months. The Olympics are over, and I'm assured by my Shanghai contacts
that
The Great Firewall of China has been relaxed, yet the problem remains.
Local loops on each end test fine to other localized ip space. Symptoms
include large-email delivery delays/failures, large file transfer
failures.
Firewalls and VPNs have been reviewed, NOCS have been contacted.
Fingerpointing is raging at its finest.
US endpoint is AS7358
Transit is AS2914
CN endpoint is AS4134
If there is anyone from those three networks who can help us figure out
why
large packets are dropping on transmits from the US to CN, I would
really
appreciate an off-list reply. Heck, I'll take any replies from anyone
that
might have some inside information or similar experiences, or give me
some
ideas on the best way to do some external black-hole router/mtu munging
detective work on these networks.
Thanks,
Andrew
