Classles in-addr.arpa delegation - parent not available

[Mathias Körber]

> I delegated part of our /24 net to a small subgroup.
> using the recipees given in DNS & BIND 3rd Ed. p. 217ff
> every(?) thing works fine.
> The subgrup has only 1 connection to the parent server.
> if that connection fails, how can the subgroup still have=20
> reverse lookup working whithin their adrressrange ,
>  as their nameserver has no possiblility=20
> to resolve the cname e.g 1.0-63.254.253.192.in-addr.arpa.

The subgroup could set their nameserver as secondary for the parent
zone (254.253.192.in-addr.arpa) and thus always have the relevant
CNAME records etc on hand locally.

Obviously, the subdomain should also have a secndary NS somewhere
outside their connection, so that the rest can resolve their
reverse records in case of failure.

HTH
mathias

>=20
> regards
>=20
> peter
>=20
> =
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> Dr. Peter Kobe                 	Mail: Peter.Kobe at uni-bonn.de
> Physikalisches Institut         WWW: =
http://www.physik.uni-bonn.de/~kobe/
> Universitaet Bonn	        Tel: (49) 228 73 3222
> D 53115 Bonn		        FAX: (49) 228 73 3220=20
> Nussallee 12
>=20
>=20