[166241] in North American Network Operators' Group
Re: comcast ipv6 PTR
daemon@ATHENA.MIT.EDU (Lee Howard)
Tue Oct 15 06:57:41 2013
Date: Tue, 15 Oct 2013 09:32:02 +0100
From: Lee Howard <Lee@asgard.org>
To: Mark Andrews <marka@isc.org>, John Levine <johnl@iecc.com>
In-Reply-To: <20131015045441.5C356832A5E@rock.dv.isc.org>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 10/15/13 7:54 AM, "Mark Andrews" <marka@isc.org> wrote:
>
>In message <20131015024711.55297.qmail@joyce.lan>, "John Levine" writes:
>> >Is there any reason other than email where clients might demand RDNS?
>>
>> There's a few other protocols that want rDNS on the servers. IRC maybe.
>>
>> Doing rDNS on random hosts in IPv6 would be very hard. Servers are
>> configured with static addresses which you can put in the DNS and
>> rDNS, but normal user machines do SLAAC where the low 64 bits of the
>> address are quasi-random. To get any sort of DNS you'd need for the
>> routers to watch when new hosts come on line and somehow tell the
>> relevant DNS servers what hosts need names.
>>
>> This would be a lot of work, so nobody does it.
>
>Actually you just need to *let* the hosts update their own ptr
>records using UPDATE.
Cool. How do I tell a residential device what name server they should send
updates to?
Remember that the ISP uses DHCPv6 or PPPoE or TR-069 to send configuration
information to the CPE, which sends DHCPv6 or RA to hosts. "Hosts" may be
computers, tablets, game consoles, phones, TVs, or other.
>
>People keep saying the PTR records don't mean anything yet still
>demand really strong authentication for updates of PTR records.
>TCP is more than a strong enough authenticator to support update
>from self.
Dynamic DNS uses TCP? I didn't realize that.
>
>You can even delegate the reverse zone when doing or just after a PD.
To a home router? How do you tell the home router that it is now
authoritative for the reverse zone?
>
>* Extend DHCPv6 to support delegations (NS or DNAME) relayed via
> the DHCP server as part of the PD. NS records would result in a
> temporarially lame delegation until the zone is configured in the
> nameserver.
Let me know when you need me to express support for your draft being
adopted by dhc WG.
Until that feature is implemented, it is of limited operational utility.
>
>Mark
Lee
