Re: Out of ideas - Comcast issue BGP peering with Tata

[jim deleskie <deleskie () gmail com>]

I many years ago worked at Tata, responsible for their BGP, they are giving
you the right answer, Comcast has to be the one contacting them, as then
both sides can see what is being sent and received and can resolve this
issue.

-jim

On Fri, Nov 17, 2023 at 10:04 AM Jamie Chetta via NANOG <nanog () nanog org>
wrote:

> 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 () tatacommunications com
>
> Tata Communications IP Service Support( AS-6453)
> IPServiceSupport () tatacommunications com
>
> IPNOC (Tata Communications - AS6453) IPNOC () tatacommunications com
>
> lg () 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.”