[125655] in North American Network Operators' Group
RE: Reverse DNS Question
daemon@ATHENA.MIT.EDU (Tarig Yassin)
Tue Apr 20 18:44:40 2010
From: Tarig Yassin <tariq198487@hotmail.com>
To: James Martin <jamesmartin@ieee.org>, <nanog@nanog.org>
Date: Wed, 21 Apr 2010 01:44:05 +0300
In-Reply-To: <r2yd64c57de1004201308sea121993p280850b9285ab096@mail.gmail.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Dear janes
as I know many services use reverse lookup as a sender authentication techn=
ique.
e.g. Email server using this technique to reduce spams.( if the ip adress =
of sending smtp server has no reverse lookup it's messages will be consider=
ed spam).
regards=2C
> Date: Tue=2C 20 Apr 2010 16:08:04 -0400
> Subject: Reverse DNS Question
> From: jamesmartin@ieee.org
> To: nanog@nanog.org
>=20
> All:
>=20
> In the process of requesting a block of IP's for a client=2C ARIN request=
ed
> that we list Reverse DNS Servers for the block. I've never done this
> before=2C nor have I ever thought it through.
>=20
> What is the purpose for this besides resolving name-based reverse lookups=
?
> Are there any definitive guides out there on how this works (besides the
> ARIN site)?
>=20
> I know this is really basic stuff but I don't know it and have never need=
ed
> to know it until now.
>=20
> Thanks
>=20
> --=20
> __________________________________
> James Martin
> jamesmartin@ieee.org
=20
_________________________________________________________________
Hotmail: Trusted email with Microsoft=92s powerful SPAM protection.
https://signup.live.com/signup.aspx?id=3D60969=
