Classless Delegation
Mathias Körber
mathias at koerber.org
Wed Nov 15 10:55:28 UTC 2000
> When your isp sets up classless delegation do they need to set a=20
> nameserver
> for your ip block?
Yes, this is a normal subdomain delegation, so (at least) 2 NS records
are required.
>=20
> example:
> 8/29 ns1.yourdomain.com.
^IN NS
> 8/29 ns2.yourdomain.com.
^IN NS=20
>=20
> 8 IN CNAME 8.8/29.0.30.172.in-addr.arpa.
> 9 IN CNAME 9.8/29.0.30.172.in-addr.arpa.
> 10 IN CNAME 10.8/29.0.30.172.in-addr.arpa.
> 11 IN CNAME 11.8/29.0.30.172.in-addr.arpa.
> 12 IN CNAME 12.8/29.0.30.172.in-addr.arpa.
> 13 IN CNAME 13.8/29.0.30.172.in-addr.arpa.
> 14 IN CNAME 14.8/29.0.30.172.in-addr.arpa.
> 15 IN CNAME 15.8/29.0.30.172.in-addr.arpa.
>=20
>=20
>=20
> from my understanding, the 8/29 refers to the subnet not the=20
> actual address
> of the NS i.e 172.30.0.8. Can the NS can be on some place else=20
> aslong as it
> has a glue record in a TLD?
The subdomain can get delegated to any nameservers. Obviously the
the nameserver(s) must themselves have proper names that
are resolvable via some forward domain (wg yourdomain.com).
Whether *that* requires glue records is unrelated.
mathias
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