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The file RESLVCNF.NET.SYS is the configuration file for the
Domain Name resolver. It should be linked to /etc/resolv.conf.
If the file does not already exist, then it can be copied from
RSLVSAMP.NET.SYS to RESLVCNF.NET.SYS and then modified
to contain information about your local domain and servers.
Each entry in the resolver file consists of a keyword followed by a value
separated by white space. The keyword and its associated value must appear on
a single line, and the keyword must start the line. Comment lines start with a
pound sign (#) or semicolon (;).
- domain
- Enter the default domain name. This string will be appended to queries
passed to the local DNS server. The default names should be written
without a trailing dot:
domain india.hp.com
It is important to get the syntax correct as the resolver does not report
errors. If more than one instance of the domain keyword is present, the
last instance will override. To specify multiple domains for an
unqualified name lookup, use the search directive.
- search
- The search directive is optional but overrides the domain directive for
specifying which domains should be searched for unqualified host name
lookups. You should add a search entry if users on a system commonly try
to connect to nodes in another domain. The format is the search directive
followed by up to six domains, separated by a white space.
search cup.hp.com hp.com
- nameserver
- The nameserver directive tells the resolver the IP address of a name
server to query. For example, the line:
nameserver 15.32.17.2
instructs the resolver to send queries to the name server running at IP
address 15.32.17.2 instead of the local host.
The resolver will also allow you to specify up to three name servers using
multiple nameserver directives. They will be tried in the order in which
they appear in the RESLVCNF file, only passing to the next listed
nameserver if the previous one is not responding. Note that the resolver
will only query subsequent name 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.
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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.
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- 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.
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