LWRESD(8)																 LWRESD(8)

NAME

       lwresd - lightweight resolver daemon

SYNOPSIS

       lwresd [ -C config-file ]  [ -d debug-level ]  [ -f ]  [ -g ]  [ -i pid-file ]  [ -n #cpus ]  [ -P port ]  [ -p port ]  [ -s ]  [ -t direc-
       tory ]  [ -u user ]  [ -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
       processes 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 the server which then resolves them using the DNS protocol. When the DNS lookup  com-
       pletes, lwresd encodes the answers in the lightweight resolver format and returns them to the client that made the request.

       If  /etc/resolv.conf  contains  any  nameserver entries, lwresd sends recursive DNS queries to those servers. This is similar to the use of
       forwarders in a caching name server. If no nameserver entries are present, or if forwarding fails, lwresd resolves the queries autonomously
       starting at the root name servers, using a built-in list of root server hints.

OPTIONS

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

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

       -f     Run the server in the foreground (i.e. do not daemonize).

       -g     Run the server in the foreground and force all logging to stderr.

       -n #cpus
	      Create  #cpus  worker  threads to take advantage of multiple CPUs. If not specified, lwresd will try to determine the number of CPUs
	      present and create one thread per CPU.  If it is unable to determine the number of CPUs, a single worker thread will be created.

       -P port
	      Listen for lightweight resolver queries on port port. If not specified, the default is port 921.

       -p port
	      Send DNS lookups to port port. If not specified, the default is port 53. This provides a way of  testing	the  lightweight  resolver
	      daemon with a name server that listens for queries on a non-standard port number.

       -s     Write memory usage statistics to stdout on exit.

	      Note: This option is mainly of interest to BIND 9 developers and may be removed or changed in a future release.

       -t directory
	      chroot() to directory after processing the command line arguments, but before reading the configuration file.

	      Warning:	This option should be used in conjunction with the -u option, as chrooting a process running as root doesn't enhance secu-
	      rity on most systems; the way chroot() is defined allows a process with root privileges to escape a chroot jail.

       -u user
	      setuid() to user after completing privileged operations, such as creating sockets that listen on privileged ports.

       -v     Report the version number and exit.

FILES

       /etc/resolv.conf
	      The default configuration file.

       /var/run/lwresd.pid
	      The default process-id file.

SEE ALSO

       named(8), lwres(3), resolver(5).

AUTHOR

       Internet Software Consortium

BIND9								   June 30, 2000							 LWRESD(8)