Reverse DNS RFCs and Recommendations

Sat Nov 2 11:27:55 UTC 2013

Hi,

Op 2 nov. 2013, om 12:16 heeft Masataka Ohta <mohta at necom830.hpcl.titech.ac.jp> het volgende geschreven:

> Mark Andrews wrote:
> 
>> 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.

You are misunderstanding the technology. Many cable operators offer a cable modem in bridged mode so that the customer can attach his own home-router behind it. Sending keys over a medium shared between multiple customers is not safe.

Cheers,
Sander