Expanding 32 and 64 blocks to class C

[Greg Zill]

Thank you very much, that helped. I use webmin for administrating my
Bind9. I see one (default) $TTL at the top of my zones and I see time
values within the SOA block. Which one would I concentrate on to lower
the TTL in advance of a massive ip move?


-------MY EXAMPLE ZONE-------
$ORIGIN .
$TTL 38400	; 10 hours 40 minutes
cribs.com		IN SOA	dns01.netshops.com.
hostmaster.netshops.com. (
				2005072804 ; serial
				10800      ; refresh (3 hours)
				3600       ; retry (1 hour)
				604800     ; expire (1 week)
				38400      ; minimum (10 hours 40
minutes)
				)
			NS	dns01.netshops.com.
			NS	dns02.netshops.com.
			A	111.111.111.111
			MX	5 mail.mydomain.com.
$ORIGIN mydomain.com.
images			CNAME	some.otherdomain.net.
mail			A	222.222.222.222
www			A	110.110.110.110

> -----Original Message-----
> From: Barry Margolin <barmar at alum.mit.edu>
> Subject: Re: Expanding 32 and 64 blocks to class C
> Date: Fri, 22 Jul 2005 20:46:22 -0400
>=20
> In article <dbs0e6$1tvd$1 at sf1.isc.org>,
>  Gregory W Zill <gregory at r3g.net> wrote:
>=20
> > I have the upcoming task of moving off of our couple smal=20
> ip blocks to a=20
> > full Class-C. I use webmin to administer my 2 BIND 9=20
> servers. I think=20
> > one of the first steps is to lower TTL to like 900. However=20
> I see two=20
> > TTL entries in each zone. Which one?
>=20
> What two TTL entries are you talking about?  $TTL directives apply to=20
> all the records that follow them, until a new $TTL directive.=20
>  So if you=20
> have something like:
>=20
> $TTL 900
> www IN A 1.2.3.4
> mail IN A 1.2.3.5
> $TTL 1800
> host1 IN A 1.2.3.6
> host2 IN A 1.2.3.7
>=20
> the TTLs of www and mail will be 900, the TTLs of host1 and=20
> host2 will=20
> be 1800.
>=20
> You can also have explicit TTLs on individual entries, e.g.
>=20
> www 3600 IN A 1.2.3.4
>=20
> The $TTL value is used as a default for records that don't=20
> have explicit=20
> TTLs like this.
>=20
> --=20
> Barry Margolin, barmar at alum.mit.edu
> Arlington, MA
> *** PLEASE post questions in newsgroups, not directly to me ***
>=20
>=20
> ------------------------------