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LWRESD(8)										LWRESD(8)

       lwresd - lightweight resolver daemon

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

       lwresd is the daemon providing name lookup services to clients that use the BIND 9  light-
       weight  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  proto-

       lwresd  listens	for  resolver  queries	on  a  UDP  port  on the IPv4 loopback interface, 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

       Incoming lightweight resolver requests are decoded by the server which then resolves  them
       using  the  DNS protocol. When the DNS lookup completes, 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

       -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 pro-
	      vides a way of testing the lightweight resolver daemon with a name server that lis-
	      tens 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 read-
	      ing 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  security  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.

	      The default configuration file.

	      The default process-id file.

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

       Internet Software Consortium

BIND9					  June 30, 2000 				LWRESD(8)
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