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added bind8 -> bind9 migration notes

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Andreas Gustafsson
2000-06-30 22:44:08 +00:00
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Copyright (C) 2000 Internet Software Consortium.
See COPYRIGHT in the source root or http://www.isc.org/copyright for terms.
BIND 8 to BIND 9 Migration Notes
BIND 9 is designed to be mostly upwards compatible with BIND 8, but
there is still a number of caveats you should be aware of when
upgrading an existing BIND 8 installation to use BIND 9.
Unimplemented Options and Changed Defaults
Some BIND 8 configuration options are still unimplemented in BIND 9,
and the default values of some options have changed. If your
named.conf file uses an unimplemented option, named will log a warning
message. A message is also logged about each option whose default has
changed unless the option is set explicitly in named.conf.
Strict RFC1035 Interpretation of TTLs in Zone Files
BIND 8 allowed you to omit all TTLs from a zone file, and used the
value of the SOA MINTTL field as a default for missing TTL values.
BIND 9 enforces strict compliance with the RFC1035 and RFC2308 TTL
rules. The default TTL is the value specified with the $TTL
directive, or the previous explicit TTL if there is no $TTL directive.
If there is no $TTL directive and the first RR in the file does not
have an explicit TTL field, the error message "no TTL specified" is
logged and loading the zone file fails.
To avoid problems, use a $TTL directive in each zone file.
Interoperability Impact of New Query Features
BIND 9 uses EDNS0 (RFC2671) to advertise its receive buffer size. It
also sets the AD bit in queries to indicate that it wishes to receive
DNSSEC responses (this usage of the AD bit is not yet standard, but
hopefully it will be soon).
Most older servers that do not support EDNS0 and/or DNSSEC, including
all known versions of BIND, will send a FORMERR or NOTIMP response to
these queries. When this happens, BIND 9 will automatically retry the
query without EDNS0 and AD.
Unfortunately, there exists at least one non-BIND name server
implementation that silently ignores these queries instead of sending
an error response. Resolving names in zones where all or most
authoritative servers use this server will be very slow or fail
completely. We have contacted the manufacturer of the name server in
case and are trying to resolve the issue with them.
$Id: migration,v 1.1 2000/06/30 22:44:08 gson Exp $