204.17.16.0/20 Unreachable via Comcast ASN 7992; Looking for Help or Contacts

Thu Aug 8 06:21:38 UTC 2013

On Wed, Aug 7, 2013 at 2:31 PM, Phil Fagan <philfagan at gmail.com> wrote:

> BGP Noob question here; but wouldn't Time Warner not recieve a prefix if it
> wasn't reachable? Is this an artifact?
>

In a perfect world, people wouldn't advertise
prefixes unless they knew they had reachability
for those prefixes.

Unfortunately, this a far, far from perfect world.

Matt

>
>
> On Mon, Aug 5, 2013 at 11:32 AM, Chad Reid <Chad.Reid at apollogrp.edu>
> wrote:
>
> > Thanks for the assistance everyone. This issue was resolved by shutting
> > down a BGP peering session between Time Warner and Comcast. --Chad
> >
> > Chad M. Reid, Network Administrator II
> > Work Hours: Sun. - Tue. 6AM-6PM and  Wed. 6AM-3PM (MST -7)
> > Apollo Group | IT Services │ IT Operations Center (ITOC)
> > 4025 S. Riverpoint Parkway │ MS: AA-M002 │ Phoenix, AZ 85040
> > phone: 602.557.6746 │ fax: 602.557.6606 │ email: chad.reid at apollogrp.edu
> >
> >
> > -----Original Message-----
> > From: Chad Reid
> > Sent: Sunday, August 04, 2013 7:41 AM
> > To: 'nanog at nanog.org'
> > Subject: 204.17.16.0/20 Unreachable via Comcast ASN 7992; Looking for
> > Help or Contacts
> >
> > Hello NANOG,
> >
> > A few hundred of our users that use Comcast in the South East United
> > States (other regions aren't affected) are unable to access our websites
> in
> > the IP block 204.17.16.0/20. Based upon testing with the users, they're
> > getting a destination unreachable from a Comcast backbone router in ASN
> > 7922:
> > be-16-pe03.56marietta.ga.ibone.comcast.net [68.86.83.134] reports:
> > Destination net unreachable.
> >
> > We're not a customer of Comcast, nor are any of our ISPs. Because of
> this,
> > we can't find anyone at Comcast to look at this issue nor do we have good
> > contact info to even reach someone. Our users in the South East can open
> > tickets with Comcast technical support, but you can imagine how
> successful
> > they are trying to explain this to frontline support and getting
> frontline
> > support to understand.
> >
> > Is anyone from Comcast on the list that can assist or know of a contact?
> >
> >
> > Chad M. Reid, Network Administrator II
> > Work Hours: Sun. - Tue. 6AM-6PM and  Wed. 6AM-3PM (MST -7) Apollo Group |
> > IT Services │ IT Operations Center (ITOC)
> > 4025 S. Riverpoint Parkway │ MS: AA-M002 │ Phoenix, AZ 85040
> > phone: 602.557.6746 │ fax: 602.557.6606 │ email: chad.reid at apollogrp.edu
> >
> >
> >
> > This message is private and confidential. If you have received it in
> > error, please notify the sender and remove it from your system.
> >
> >
> >
> >
>
>
> --
> Phil Fagan
> Denver, CO
> 970-480-7618
>
>