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[ale] Question DNS Reverse Zones
- Subject: [ale] Question DNS Reverse Zones
- From: warlord at MIT.EDU (Derek Atkins)
- Date: Tue, 12 Oct 2010 10:54:17 -0400
- In-reply-to: <[email protected]> (Michael Trausch's message of "Mon, 11 Oct 2010 22:15:02 -0400")
- References: <[email protected]> <[email protected]>
Michael Trausch <mike at trausch.us> writes:
> Reverse delegation isn't possible with IPv4 records with CIDR subnets. Well,
> kind of. Not in a std way, anyway. IPv
> 6 records support it because of their nybble granularity.
Actually, there is a standard way to do this by using CNAME records to
point to a CIDR-INADDR domain. Let's say that you have the domain
w.x.y.z/28, then you can use CIDR-Inaddr to get that domain delegated to
you. In y.x.w.in-addr.arpa (the ISP's zone) you put:
z_28 NS (client servers)
z CNAME z.z_28
z+1 CNAME z+1.z_28
...
z+15 CNAME z+15.z_28
Then in your servers you make a zone:
z_28.y.x.w.in-addr.arpa
z PTR ...
z+1 PTR ...
...
z+15 PTR ...
> Anyway, your ISP will have a procedure to use for asking for an rDNS update.
> It is probably buried somewhere though.
This is probably easier.
> ? Mike
>
-derek
--
Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
Member, MIT Student Information Processing Board (SIPB)
URL: http://web.mit.edu/warlord/ PP-ASEL-IA N1NWH
warlord at MIT.EDU PGP key available