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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