November 2000
Intermediate to advanced
336 pages
7h 53m
English
Content preview from Concise Guide to DNS and BIND, The
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Zone Data Mistakes
I mentioned RFC 1912 earlier. Much of the RFC deals with mistakes in zone data files. Running nslint or dnswalk (for both, see Chapter 7) helps you find such mistakes. Some of the most common are as follows:
The HINFO record takes two items of data: the CPU and the OS fields. If one of the fields contains whitespace, it must be quoted as follows:
tdr HINFO "IBM PC" OpenBSD
Always quoting the values is a good idea.
Matching A and PTR records. The named A record pointed to by a PTR record should point back to the address of the PTR record. Even if a host has several A records pointing to it, only one PTR record is expected. Using a tool such as mkrdns (see Chapter 7) to generate reverse zones is a good idea, but nslint and dnswalk ...
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