home *** CD-ROM | disk | FTP | other *** search
- Sun Jul 24 18:07:09 EDT 1994
- ----------------
- This kit consists of the following files:
-
- MULTIZDB this file
- MZDB.patch a patch file
- ns_init.c complete replacement for nslookup/ns_init.c
-
- (I included a new version of ns_init.c since it was dramatically
- rearranged. There isn't that much new functionality there, but lots
- of old things were done in ways inconvenient for this extension.)
- ns_init.c and the patches are based on BIND 4.9.3-beta-9. Sorry in
- advance for the difference in code indent style, but somebody can run
- it through a beautifier later.
-
- The patch enables MULTIZDB by default, but it has no effect unless you
- put "multizone" directives in your named.boot file.
- ----------------
-
-
- This is a description of the Multizone Database File (MULTIZDB)
- extension for BIND. The overall feature is controlled via an option;
- to enable it, define MULTIZDB in "conf/options.h".
-
- MULTIZDB allows you to put records from more than one zone in a single
- database file. For some scenarios, this can simplify database
- maintenance, and, by simplifying it, make it less error-prone. The
- MULTIZDB extension affects only the local storage format of the zone
- files. It does not affect any DNS protocol elements nor does it alter
- any algorithm by which BIND arrives at an answer.
-
- A simple example is that of a DNS administrator who happens to have
- authority for a subdomain and a Class C network address, and where the
- two happen to be well-aligned. The standard way to operate BIND for
- this case would be to have two database files. First, for the forward
- zone, e.g., buzz.bomb.org ==> db.buzz. Second, for the reverse
- mapping zone, e.g., 23.45.201.in-addr.arpa ==> db.201.445.23.
- Whenever an endpoint is added, deleted, or changed, both database
- files must be updated. With MULTIZDB, both zones could be kept in a
- single file, making it more likely that both halves of an update would
- be done in synch.
-
- A new keyword, multizone, is recognized for named.boot. It takes as
- its single argument the name of the file containing the resource
- records. Like other directives in named.boot, the filename is
- relative to the assumed directory.
-
- A handful of new $ directives are recognized inside a multizone
- database file:
-
- $primary
- $secondary
- $stub
- $cache
-
- These are like the similarly-named directives from the named.boot
- file. For $primary, if a database file is named, it is ignored.
- ($secondary, $stub, and $cache are provided primarily for completeness
- since in most scenarios there is no real win in putting that
- information in a multizone database file instead of in named.boot.)
- These directives demark zones inside the multizone database file.
- Logically, it's as if the reading of a new file were begun at that
- point. Multizone database files do not nest and may not contain
- $include directives.
- --
- Bill@attmail.com billc@pegasus.ATT.COM or
- +1 908 576 2932, Fax x4473 William_J_Carpenter@ATT.COM
- AT&T Bell Labs / AT&T EasyLink Services LZ 3C-207
-