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Migrating from Solaris 9 Enterprise Edition on Sun Fire V440 with BIND 8.3.3

to Solaris 10 Enterprise Edition on Dell PowerEdge R900 with BIND 9.3.5-P1

Pre-migration considerations

This section reviews some of the topics you should consider prior to

migrating your DNS servers. We consider some general concerns

and then focus on some of the differences between BIND 8 and

BIND 9.

Before beginning any upgrade, you should carefully map out your

DNS infrastructure and make certain that the upgrade will not

adversely affect your slave servers, DNS zone transfers, and so on.

General considerations

Mixed environments. If you are working in a mixed environment,

one with both BIND and non-BIND servers, be sure not to use

features that will break the non-BIND servers. Migration in a mixed

environment, such as a Solaris/Windows environment, is outside

the scope of this Guide.

Old versions of BIND. BIND 9 uses the many-answers zone

transfer format by default. The many-answers format is more

efficient that the one-answer format because it packs as many

resource records as possible into a message. However, older

versions of BIND, such as BIND 4, cannot interpret the many-

answers format. These issues are outside the scope of this Guide.

However, for security reasons, you should consider upgrading any

such servers to a later version of BIND.

Redundancy. Because DNS is a critical service, you do not want it

to have a single point of failure. When consolidating DNS servers,

be sure to reserve the appropriate level of redundancy for your

organization.

Security. The techniques in this Guide will allow you to consolidate

multiple DNS servers on a single system securely, even when some

of the servers are internal and others are external. However, your

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Dell 3-DNS Technical Information Seite 7