DNS/BIND/minimal-responses/9.12について、ここに記述してください。

1. minimal-responses

If set to yes, then when generating responses the server will only add records to the authority and additional data sections when they are required (e.g. delegations, negative responses).

• This may improve the performance of the server.

When set to no-auth, the server will omit records from the authority section unless they are required, but it may still add records to the additional section.

When set to no-auth-recursive, this is only done if the query is recursive. When the query is not recursive, the effect is same as if no was specified.

These settings are useful when answering stub clients, which usually ignore the authority section.

no-auth-recursive is designed for mixed-mode servers which handle both authoritative and recursive queries.

The default is no-auth-recursive.

[結局のところ、not recursiveなauthoritative serverの動作はnoのままということです。] -- ToshinoriMaeno 2018-03-17 11:26:18

2. glue-cache

• When set to yes, a cache is used to improve query performance when adding address-type (A and AAAA) glue records to the additional section of DNS response messages that delegate to a child zone. The glue cache uses memory proportional to the number of delegations in the zone. The default setting is yes, which improves performance at the cost of increased memory usage for the zone. If you don't want this, set it to no.

m== ultiple-cnames ==

• This option was used in BIND 8 to allow a domain name to have multiple CNAME records in violation of the DNS standards. BIND 9.2 onwards always strictly enforces the CNAME rules both in master files and dynamic updates.