lwresd [-C config-file] [-d debuglevel] [-f -g -s] [-i pid-file] [-n
            #cpus] [-P listen-port#] [-p port#] [-t directory] [-u user-id]
            [-v]


DESCRIPTION

     lwresd is the daemon providing name lookup services to clients that use
     the BIND 9 lightweight resolver library.  It is essentially a stripped-
     down, caching-only name server that answers queries using the BIND 9
     lightweight resolver protocol rather than the DNS protocol.

     lwresd listens for resolver queries on a UDP port on the IPv4 loopback
     interface, 127.0.0.1.  This means that lwresd can only be used by pro­
     cesses running on the local machine.  By default UDP port number 921 is
     used for lightweight resolver requests and responses.

     Incoming lightweight resolver requests are decoded by lwresd which then
     resolves them using the DNS protocol.  When the DNS lookup completes,
     lwresd encodes the answers from the name servers in the lightweight re­
     solver format and returns them to the client that made the original re­
     quest.

     If /etc/resolv.conf contains any nameserver entries, lwresd sends recur­
     sive DNS queries to those servers.  This is similar to the use of for­
     warders in a chaching name server.  If no nameserver entries are  pre­
     sent, or if forwarding fails, lwresd resolves the queries autonomously
     starting at the root name servers, using a compiled-in list of root
     servers hints.

     The options to lwresd are as follows:

     -C      use config-file as the configuration file instead of the default,
             /etc/resolv.conf.

     -d      set the daemon's debug level to debuglevel. Debugging traces from
             lwresd become more verbose as the debug level increases.

     -f      run lwresd in the foreground.

     -g      run lwresd in the foreground and force all logging to stderr.

     -i      write the daemon's process id to pid-file instead of the default
             pathname.

     -n      create #cpus worker threads to take advantage of multiple CPUs.
             If no option is given, lwresd will try to determine the number of
             CPUs present and create one thread per CPU.  If lwresd is unable
             to determine the number of CPUs, a single worker thread is creat­
             ed.

     -P      listen for lightweight resolver queries on the loopback interface
             using UDP port port# instead of the default port number, 921.

     -p      send DNS lookups to port number listen-port# when querying name
             servers.  This provides a way of testing the lightweight resolver
             daemon with a name server that listens for queries on a non-stan­
             dard port number.
             daemon will change its user-id after it has carried out any priv­
             ileged operations, such as writing the process-id file or binding
             a socket to a privileged port (typically any port less than
             1024).

     -v      report the version number and exit.


FILES

     /etc/resolv.conf     default configuration file
     /var/run/lwresd.pid  default process-id file


SEE ALSO

     named(8),  lwres(3).


NOTES

     lwresd is a daemon for lightweight resolvers, not a lightweight daemon
     for resolvers.

 BIND9                           Jun 30, 2000                                2

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