[166650] in North American Network Operators' Group
Re: Reverse DNS RFCs and Recommendations
daemon@ATHENA.MIT.EDU (Masataka Ohta)
Sat Nov 2 07:13:31 2013
Date: Sat, 02 Nov 2013 20:16:09 +0900
From: Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp>
To: Mark Andrews <marka@isc.org>
In-Reply-To: <20131102105133.96AB496F732@rock.dv.isc.org>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Mark Andrews wrote:
>> Over the cable modem?
>
> Yes.
OK.
>> The cable modem is the CPE, which accept the DHCP packet to it.
>
> A cable modem both accepts DHCP packets (for management of the
> modem) and passes DHCP packets through to the customer device.
Even if the CPE does so, which means there is no NAT, the key
to update rDNS must, naturally, be contained only in DHCP reply
to the CPE.
And, I'm afraid your draft assumes that the CPE behaves as a
DHCP server for local hosts, which means the CPE is responsible
for rDNS registration.
Masataka Ohta
