[166651] in North American Network Operators' Group
Re: Reverse DNS RFCs and Recommendations
daemon@ATHENA.MIT.EDU (Sander Steffann)
Sat Nov 2 07:28:10 2013
From: Sander Steffann <sander@steffann.nl>
In-Reply-To: <5274DEF9.3040405@necom830.hpcl.titech.ac.jp>
Date: Sat, 2 Nov 2013 12:27:55 +0100
To: Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp>
Cc: "nanog@nanog.org list" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Hi,
Op 2 nov. 2013, om 12:16 heeft Masataka Ohta =
<mohta@necom830.hpcl.titech.ac.jp> het volgende geschreven:
> Mark Andrews wrote:
>=20
>> A cable modem both accepts DHCP packets (for management of the
>> modem) and passes DHCP packets through to the customer device.
>=20
> 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
