iX 6.5)

Chapter 8 135

DNS BIND/iX

Conﬁguring the DNS Resolver

servers if there is no response, if the previous

nameserver has already replied that it cannot resolve a

query, no further lookup will be attempted.

NOTE It is very important that you omit the leading zeros in the domain name

resolver ﬁles. If you enter leading zeros here, the resolver routines will

interpret the numbers as octal numbers.

sortlist This directive is a mechanism which lets you specify

subnets and networks for the resolver to prefer if it

receives multiple addresses as a result of a query. The

format is the sortlist directive, followed by a list of

network addresses may also include a subnet mask,

which immediately follows the address, preceded by a

slash symbol (/).

sortlist 128.32.42.0/255.255.255.0 15.0.0.0

options The options directive lets you set two internal resolver

settings.

options debug

The above directive will set an internal ﬂag which

causes debugging information to be produced on

standard output.

options ndots:2

The above directive sets the minimum number of dots a

domain name query must contain before the resolver

will assume that it is a fully qualiﬁed name and

therefore does not need to append the default domain

(or searchlist argument) before sending it to the server.

The options directive can combine both settings on the

same line.

options debug ndots:2

lines Beginning with a pound sign (#) or a semicolon (;) in the

ﬁrst column, they are interpreted as comments and

ignored by the resolver.