How to migrate bind to another IP block?

[Mark Andrews]

> 
> I have to move some domains and their DNS server from a class C to a new 
> /27 block elsewhere. Can someone provide an example of a minimal 
> (skeleton) named.conf and db.something to help me get bind set up? I'm 
> also moving an MTA, so an MX record would be helpful.
> 
> Thanks in advance,
> 
> -Steve
> 

	The only real difference is that you don't have a full /24
	assigned to you.  This needs to be handled specially.

	See RFC 2317, Classless IN-ADDR.ARPA delegation.

	Assuming you have been delegated 1.2.3.32/27 and you and
	your ISP decide to use 32-63.3.2.1.in-addr.arpa as the zone
	name your side should look something like this.

	You will have a local copy of the reverse for the /24 your
	address space is delegated from.  This will allow you to
	always have the CNAMEs to map from the well known names to
	the names that actually have the PTR records even when your
	external link is down.  You will also have a zone
	(32-63.3.2.1.in-addr.arpa) with the PTR records.

	Mark

zone "3.2.1.in-addr.arpa" {
	type slave;
	file "slave/3.2.1.in-addr.arpa";
	masters { /* ISP's auth servers here */ };
	notify no;
};

zone "32-63.3.2.1.in-addr.arpa" {
	type master;
	file "master/32-63.3.2.1.in-addr.arpa";
};

master/32-63.1.2.3.in-addr.arpa:
$TTL 3600
@	SOA	...
@	NS	...
@	NS	...
33	PTR	...
34	PTR	...
...
62	PTR	...

--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org