Reverse DNS for IPv6 client networks

Lee Howard lee at
Thu Sep 16 14:09:24 UTC 2010

I've written an internet-draft on the subject:

The latest update was to add a Recommendations section:
The best option is for ISPs to delegate authority along with address
   delegation.  Where users do not operate authoritative name servers,
   the next best option is dynamic DNS updates.  Where dynamic DNS is
   impractical, the next best option is to dynamically generate PTR
   records when queried.

In other words, when you do prefix delegation to a residential
customer, generate records on the fly.  Ask your DNS vendor to
show you how.  Wildcards work if all you want is a non-null response.

I'm looking for support or opposition to this.  I just can't see any
better way to do it.


> -----Original Message-----
> From: Elmar K. Bins [mailto:elmi at]
> Sent: Tuesday, September 14, 2010 8:28 AM
> To: nanog at
> Subject: Reverse DNS for IPv6 client networks
> Hi guys,
> I am looking for operational experience here.
> We have just turned up IPv6 in our "guest wireless", by way of using RA
> for address distribution and DHCPv6 for the DNS server address (stupid,
> Apart from the dhcp6 part seemingly not working on Juniper ISGs (or maybe
> my windows *and* that Ubuntu), I now see IPv6 addresses instead of names.
> I as a networking droid have not much quarrel with that, but I am
> in how or whether at all others handle this.
> Are you creating DNS entries somehow (reverse and, ultimately, forward),
> are you using BIND "generate" statements, are you using wildcards...or
> are you just ignoring this for the "dynamic boxes"?
> Please enlighten me!
> Elmar.

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