Comcast Support doesen't undrstand IPv6
I am rather irked.
I called into Comcast technical support with an extremely "Network Troubleshooting 101" problem.
We run a mailserver. It is on a Comcast Business account and it has a static IPv4 address on it. Because we live in a city that does not yet have IPv6 (Portland OR, and yes I just signed up for the Comcast beta IPv6 test) we have a tunnel to Hurricaine Electric
Our mailserver thus has an IPv6 address on it as well as IPv4 (it is dual-numbered)
We have users who are attempting to send e-mails to customers on Comcast. I can see in or mailserver log a successful connection and delivery. Here's a snippit (e-mail address has been changed)
Apr 22 12:18:47 smtp sm-mta: r3MJIbxt016094:
3254, relay=mx2.comcast.net. [IPv6:2001:558:fe2d:70::22], dsn=2.0.0,
stat=Sent (T7Jh1l00Z1HiJgm047JjQh mail accepted for delivery)
Source IP on that is 2001:470:c1aa::1 As you can see from the log, Comcast's mailserver took the
mail message via IPv6 AS IT IS SUPPOSED TO DO IF IT ADVERTISES IPv6 MX RECORDS. and the server ACKNOWLEDGED SUCCESSFUL RECEIPT.
But, the Comcast subscriber never gets the mail message in their Comcast inbox.
I have no problem sending to gmail addresses via IPv6.
My bitch is that when I called into Comcast tech support, the first thing the guy does is verify a PTR record exists. He tells me one does not. I tell him, sorry but according to many IPv6 PTR lookup tools on the Internet, yes it does. Then he tells me that he can't access any of these websites, he can only look at internal tools that look at their own PTR records.
If Comcast is assigning /48's THEN THEY ARE DELEGATING IPv6 PTR records since delegation is done on a nibble boundary. There's NO EFFING WAY that he can lookup a PTR record in Comcast's database using some querytool that doesen't use dns BECAUSE IT ISN"T IN the Comcast database. He MUST use DNS.
I told the guy point blank - escalate this. He did.
Let me make this very clear. In many markets Comcast supplies IPv6 as well as IPv4. If Comcast's front-line tech support people are ignorant of IPv6 then they need to be educated. If the tools that they are given to help people are IPv4 ONLY then they need to be fixed.
HOW IN THE HECK can a support tech help anyone if they can't bring up a website? WTF is that all about?
The Comcast ticket# is CR318410213