Dell 3-DNS Technical Information PDF herunterladen (Seite 9)

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

o Line breaks not within parentheses will cause a

syntax error.

o BIND 9 now deprecates $$ in favor of \$.

Interoperability impact of new protocol features

• EDNS0. Support for EDNS0 is new in BIND 9. BIND 9

assumes that servers not supporting EDNS0 will return an

error. However, some servers ignore EDNS0 requests. In

these cases, name resolution may be slow, or even fail.

• Many-answers now the default for zone transfers. As

we noted previously, this new default setting may cause

problems with older BIND 4 servers. If you cannot upgrade

these servers, you will need to specify using one-answer for

the transfer-format clause on any such servers.

Unrestricted character set

• BIND 9 implements the full 8-bit character set and does not

restrict its use. However, versions of BIND from 9.3.0 on do

implement the check-names option, allowing you to ensure

that your labels conform to RFC252

No information leakage between zones

• In BIND 8, the name server (NS) resource records from a

child could “leak” to the parent, modifying the parent

configuration. Some BIND 8 installations use this behavior

to avoid adding glue NS records to the parent. (Glue records

are records that a zone stores for the name servers in its

subdomains.) BIND 9 complies with RFC1035

, so you may

need to add the glue records to your configuration.

umask not modified

• BIND 8 unconditionally set the file permission mask

(umask) to 022, which caused files to have permissions of

644 (rw-r--r--) and directories to have permissions of 755

(rwxr-xr-x). In contrast, BIND 9 inherits the file permission

of its parent process. If this inheritance causes you any

problems, you can set the umask from the command line by

typing the umask command.

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Dell 3-DNS Technical Information Seite 9