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OPENNHRP(8)		    OpenNHRP Documentation		   OPENNHRP(8)

NAME
       opennhrp - daemon to resolve next hop address in NBMA network

SYNOPSIS
       opennhrp [option]...

DESCRIPTION
       opennhrp	 implements  the  Next Hop Resolution Protocol (NHRP) which is
       used to improve the efficiency of routing computer network traffic over
       Non-Broadcast, Multiple Access (NBMA) Networks.

       NHRP  provides an ARP-like solution that allows a system to dynamically
       learn the NBMA address of the other systems that are part of that  net‐
       work,  allowing these systems to directly communicate without requiring
       traffic to use an intermediate hop.

       opennhrp implementation is based on RFC2332, but contains some  modifi‐
       cations and extensions to be compatible with Cisco NHRP/DMVPN implemen‐
       tation.	Modifications have been	 made  for  authentication  extension,
       Cisco  NAT  address  extension and shortcut switching enhancements sup‐
       port.

OPTIONS
       The following options are recognized:

       -a admin-socket
	      Specify  management  interface  socket  as  admin-socket.	   The
	      default is /var/run/opennhrp.socket.

       -c config-file
	      Use  config-file instead of /etc/opennhrp/opennhrp.conf for con‐
	      figuration.

       -s script-file
	      Execute script-file instead of /etc/opennhrp/opennhrp-script  on
	      important events.

       -p pid-file
	      Store  process  id in pid-file instead of /var/run/opennhrp.pid.
	      This file is also used to detect if opennhrp daemon  is  already
	      running.	Pid-file is not created unless -d is specified too.

       -d     Run in daemon mode, forking to background after initialization.

       -v     Verbose. Print more log messages.

       -V     Print version and exit.

SIGNALS
       SIGHUP Forget all cached information about other system addresses.

       SIGUSR1
	      Dump NHRP peer database to system log.

FILES
       /etc/opennhrp/opennhrp.conf
	      The  system  wide	 configuration	file. See opennhrp.conf(5) for
	      further details.

       /etc/opennhrp/opennhrp-script
	      Script  executed	by   opennhrp	on   important	 events.   See
	      opennhrp-script(8)  for  more information how the script is exe‐
	      cuted.

       /var/run/opennhrp.socket
	      opennhrp(8) control socket

BUGS
       Currently only IPv4 over IPv4 networks using NBMA GRE tunnels  is  sup‐
       ported (you need Linux kernel 2.6.24-rc2 or later).

       Replying with cached information to non-authorative resolution requests
       is not implemented.

       Please send bug reports to OpenNHRP issue tracker in SourceForge.

SEE ALSO
       opennhrp.conf(5), opennhrpctl(8), opennhrp-script(8)
       http://sourceforge.net/projects/opennhrp

       For more information about the protocol see:
       RFC2332 NBMA Next Hop Resolution Protocol (NHRP)
       RFC2333 NHRP Protocol Applicability Statement

AUTHORS
       Timo Teras <timo.teras@iki.fi>

			       16 November 2007			   OPENNHRP(8)

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