RE: 204.17.16.0/20 Unreachable via Comcast ASN 7992; Looking for Help or Contacts
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@apollogrp.edu -----Original Message----- From: Chad Reid Sent: Sunday, August 04, 2013 7:41 AM To: 'nanog@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@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.
BGP Noob question here; but wouldn't Time Warner not recieve a prefix if it wasn't reachable? Is this an artifact? On Mon, Aug 5, 2013 at 11:32 AM, Chad Reid <Chad.Reid@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@apollogrp.edu
-----Original Message----- From: Chad Reid Sent: Sunday, August 04, 2013 7:41 AM To: 'nanog@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@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
On Wed, Aug 7, 2013 at 2:31 PM, Phil Fagan <philfagan@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@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@apollogrp.edu
-----Original Message----- From: Chad Reid Sent: Sunday, August 04, 2013 7:41 AM To: 'nanog@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@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
It's a fair question and had nothing to do with the other network (TW Telecom, in this case, not TIme Warner Cable). Sorry for not filling in details sooner. We recently needed to adjust the scale profile on some of our Cisco ASR9k trident chip (80gig) Line Cards as we reached . The default profile only supports up to 512k routes and will notify that CEF has run out of DATA_TYPE_TABLE_SET space as a result. The profile change required (profile 13) requires a reload of the chassis. please be advised. You might want to review with your local support team. The symptom involved BGP neighbor instability and unreachability of some destinations. Shutting down that particular BGP session was a temporary work-around until the adjustment could be made during a demand maintenance window to minimize disruption. Thanks, Tony On Wed, Aug 7, 2013 at 5:31 PM, Phil Fagan <philfagan@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?
On Mon, Aug 5, 2013 at 11:32 AM, Chad Reid <Chad.Reid@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@apollogrp.edu
-----Original Message----- From: Chad Reid Sent: Sunday, August 04, 2013 7:41 AM To: 'nanog@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@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
Interesting; instability due to reaching this table limit? Good info! On Thu, Aug 8, 2013 at 10:39 AM, Tony Tauber <ttauber@1-4-5.net> wrote:
It's a fair question and had nothing to do with the other network (TW Telecom, in this case, not TIme Warner Cable). Sorry for not filling in details sooner.
We recently needed to adjust the scale profile on some of our Cisco ASR9k trident chip (80gig) Line Cards as we reached . The default profile only supports up to 512k routes and will notify that CEF has run out of DATA_TYPE_TABLE_SET space as a result. The profile change required (profile 13) requires a reload of the chassis. please be advised. You might want to review with your local support team.
The symptom involved BGP neighbor instability and unreachability of some destinations. Shutting down that particular BGP session was a temporary work-around until the adjustment could be made during a demand maintenance window to minimize disruption.
Thanks, Tony
On Wed, Aug 7, 2013 at 5:31 PM, Phil Fagan <philfagan@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?
On Mon, Aug 5, 2013 at 11:32 AM, Chad Reid <Chad.Reid@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@apollogrp.edu
-----Original Message----- From: Chad Reid Sent: Sunday, August 04, 2013 7:41 AM To: 'nanog@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@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
-- Phil Fagan Denver, CO 970-480-7618
participants (4)
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Chad Reid -
Matthew Petach -
Phil Fagan -
Tony Tauber