[150628] in North American Network Operators' Group
Re: Time Warner Cable issues in Ohio ?
daemon@ATHENA.MIT.EDU (Jonas Frey (Probe Networks))
Tue Feb 28 18:39:03 2012
From: "Jonas Frey (Probe Networks)" <jf@probe-networks.de>
To: Randy Carpenter <rcarpen@network1.net>
In-Reply-To: <2058610f-083b-4083-a275-08049ccb7c95@zimbra.network1.net>
Date: Wed, 29 Feb 2012 00:38:01 +0100
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Sounds very much like an issue with a link aggregation.
Seen this a couple of times with various carriers...apparently
monitoring lag's isnt a top priority nowadays.
Try to find out which hop is causing the problems (do multiple
traceroute's or use mtr on affected and unaffected servers) and drop TWC
a mail.
Am Dienstag, den 28.02.2012, 18:22 -0500 schrieb Randy Carpenter:
> We're seeing some strange issues with our fiber connection to TWC in Ohio. Intermittent packet loss to/from some IPs.
>
> It gets as specific as from a certain IP outside our network, packets to a.b.c.10 are fine, but pings to a.b.c.50 (same subnet of same netblock) lose ~75% of the packets.
>
> Likewise, from one of our IPs, connections are fine to a particular remote host, but not to another host on the same network.
>
> Connections to/from some other IPs (and some whole networks) are totally fine.
>
> It almost seems that some piece of gear somewhere is barfing on packets that have a particular set of bits in the source and/or destination address.
>
> We have manually failed over to a backup connection, and are 100% fine now.
>
> I just want to see if anyone has seen anything similar, or has any info. I am on hold now waiting for someone at TWC.
>
> thanks,
> -Randy
>
