Out of ideas - Comcast issue BGP peering with Tata

Fri Nov 17 15:49:30 UTC 2023

This passing the buck thing was old a very long time ago. 

CDNs and security services are great at it too. 

----- 
Mike Hammett 
Intelligent Computing Solutions 
http://www.ics-il.com 

Midwest-IX 
http://www.midwest-ix.com 

----- Original Message -----

From: "Jamie Chetta via NANOG" <nanog at nanog.org> 
To: nanog at nanog.org 
Sent: Friday, November 17, 2023 8:17:42 AM 
Subject: Out of ideas - Comcast issue BGP peering with Tata 

I am out of ideas on how to get this fixed. Long story short I am a customer of Comcast and am advertising my own /24 block I own through them. Comcast of course BGP peers with multiple ISPs. Other ISPs are accepting my prefix just fine, except Tata. This is causing random destinations to drop connectivity if Comcast routes it through them. Comcast has confirmed they are advertising my block to Tata and that the RPKI is good, however when you check the Tata looking glass you can see they’re not accepting it. 

I’ve tried escalating within Comcast who refuses to contact Tata as they’ve validated the issue is not on their end but they agree with my assessment that Tata is not accepting the prefix for some reason. 

I’ve tried multiple email for Tata support (below), but they all circle around to a helpdesk who says I do not have a circuit with them so they cannot help me. 

Is there anyone from Tata willing to contact me off list to help sort this out? Or anyone with ideas on specifically why other ISPs are accepting my route but not Tata? It would be greatly appreciated. 

Emails I’ve tried 
Corporate Helpdesk corp.helpdesk at tatacommunications.com 
Tata Communications IP Service Support( AS-6453) IPServiceSupport at tatacommunications.com 
IPNOC (Tata Communications - AS6453) IPNOC at tatacommunications.com 
lg at as6453.net 

Response from Tata: 
“ Acknowledge your email. 

However, since you are not associated with TCL we would not be in a position to help you on this. 

Request you to contact comcast for the assistance that you are seeking from us.” 

Response from Comcast: 
“ This was sent back to me as not us. Basically, it’s not a RADB or RPKI issue. This is being accepted and re-advertised to TATA but not being accepted on their end. But another route that we checked off of that same SUR is being advertised the same way and accepted by them off pe12.350ecermak.il.ibone as an example of the TATA looking glass. I would suggest that you would probably need to work with other networks as to why those that are specific ones are not accepting the block but as previously mentioned it’s not a RADB or RPKI issue and as a result not a Comcast issue.” 
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