OT: need SBCIS (7132) contact with DNS clue

Martin J. Levy mahtin at mahtin.com
Fri Mar 21 23:17:24 UTC 2003


Eddy,

If you have an xDSL line with static IP's on a /27, then PBI/SBC will setup the DNS as follows.  In this example W is the base IP of the network (ie: 0,8,16,24,32,40,48, etc.) and (W+n) should just be a number and not have parentheses or a plus!

PCI/SBC will add the following to their zone files...

        W.X.Y.Z.in-addr.arpa.           IN NS   <your-nameservers>
        W.X.Y.Z.in-addr.arpa.           IN NS   <your-nameservers>
        W.X.Y.Z.in-addr.arpa.           IN NS   <your-nameservers>

In my case they did NOT list PBI/SBC as a "NS" for that specific zone, hence it always comes over to my boxes.

Then PBI/SBC will add this in their zone files...

        (W+0).X.Y.Z.in-addr.arpa.       IN CNAME (W+0).W.X.Y.Z.in-addr.arpa.
        (W+1).X.Y.Z.in-addr.arpa.       IN CNAME (W+1).W.X.Y.Z.in-addr.arpa.
        (W+2).X.Y.Z.in-addr.arpa.       IN CNAME (W+2).W.X.Y.Z.in-addr.arpa.
        (W+3).X.Y.Z.in-addr.arpa.       IN CNAME (W+3).W.X.Y.Z.in-addr.arpa.
        (W+4).X.Y.Z.in-addr.arpa.       IN CNAME (W+4).W.X.Y.Z.in-addr.arpa.
        (W+5).X.Y.Z.in-addr.arpa.       IN CNAME (W+5).W.X.Y.Z.in-addr.arpa.
        (W+6).X.Y.Z.in-addr.arpa.       IN CNAME (W+6).W.X.Y.Z.in-addr.arpa.

PBI/SBC did not do the W+7 entry for me but they did do the W+0 entry. :-)

That all said, you just need to add one zone "W.X.Y.Z.in-addr.arpa" on your side.

Why is this confusing?  Because if you got the same email as I did... they didn't even come close to explaining it this way and hence why your worried about the recurse on the NS's.

Contact email address I have in my files for PBI/SBC DNS are...

        "HARPER, LACONTRIA (SBIS)" <lh6712 at sbc.com> 
        DESC Central <DESCCentral at sbis.sbc.com> 

Note that I don't work for SBC, I just use an xDSL line at home.

Martin

----------
At 10:44 PM 3/21/2003 +0000, E.B. Dreger wrote:

>Greetings all,
>
>
>Anyone have an SBCIS (AS7132) contact with DNS clue?  I'm being
>told it's "company policy" that they list their nameservers as
>authoritative for reverse DNS on space assigned from their
>netblocks.  IOW, they "delegate" by creating NS RRs that point to
>the correct NSes _and_ NS RRs pointing to their own.
>
>It gets better.  Like all good "authoritative" NSes, their NSes
>disallow recursive processing.  Is it truly company policy to
>screw up reverse DNS for downstreams who run their own?
>
>Wanted: AS7132 contact who understands the concept of lame
>servers, why they are bad, and is willing and able to help do
>something about it.
>
>
>Eddy
>--
>Brotsman & Dreger, Inc. - EverQuick Internet Division
>Bandwidth, consulting, e-commerce, hosting, and network building
>Phone: +1 (785) 865-5885 Lawrence and [inter]national
>Phone: +1 (316) 794-8922 Wichita
>
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>Date: Mon, 21 May 2001 11:23:58 +0000 (GMT)
>From: A Trap <blacklist at brics.com>
>To: blacklist at brics.com
>Subject: Please ignore this portion of my mail signature.
>
>These last few lines are a trap for address-harvesting spambots.
>Do NOT send mail to <blacklist at brics.com>, or you are likely to
>be blocked.




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