Open System Services System Calls Reference Manual (G06.29+, H06.08+, J06.03+)
Miscellaneous resolv.conf(5)
might be slow and generates a lot of network traffic if the servers for the listed
domains are not local. Queries time out if no server is available for one of the
domains.
The domain and search keywords are mutually exclusive. If more than one
instance of these keywords is present, the last instance takes precedence.
sortlist addre sslist
Allows addresses returned by internal function calls to be sorted.
An addresslist is specified by IP address netmask pairs. The netmask pairs are
optional; an unspecified netmask defaults to the natural netmask of the net. The
IP address and optional netmask pairs are separated by slashes. Up to 10 net-
mask pairs may be specified.
Example: sortlist 130.155.160.0/255.255.240.0 130.155.0.0
options option...
Allows internal resolver variables to be modified. Possible values for option are:
debug Sets RES_DEBUG in the _res.options field.
ndots:n Sets a threshold floor for the number of dots which must appear
in a name before an initial absolute (as-is) query is performed.
The default value for n is 1, which means that if there are any
dots in a name, the name is tried first as an absolute name before
any search list elements are appended to it.
timeout:n Sets the amount of time the resolver waits for a response from a
remote name server before retrying the query via a different
name server. Measured in seconds, the default is
RES_TIMEOUT (described in the <resolv.h> header file).
attempts:n Sets the number of times the resolver sends a query to its name
servers before giving up and returning an error to the calling
application. The default is RES_DFLRETRY (described in
the <resolv.h> header file).
no-check-names
Sets RES_NOCHECKNAME in _res.options. This disables
the modern BIND checking of incoming host names and mail
names for invalid characters such as underscore (_), nonASCII,
or control characters.
You can override the search keyword of the resolv.conf file on a per-process basis by setting the
environment variable LOCALDOMAIN to a space-separated list of search domains.
You can amend the options keyword of the resolv.conf file on a per-process basis by setting the
environment variable RES_OPTIONS to a space-separated list of resolver options.
EXAMPLES
Example lines from a /etc/resolv.conf file are shown below:
domain dev1.anyfirm.com
nameserver 123.456.78.90
nameserver 123.456.78.91
527186-023 Hewlett-Packard Company 12−65