ODHCPLOC(8)		  BSD System Manager's Manual		   ODHCPLOC(8)

NAME
     odhcploc -- locate and display active DHCP servers on the subnet

SYNOPSIS
     odhcploc [-pVv] [-c count] [-i interval] my_ip [valid_dhcp...]

DESCRIPTION
     The odhcploc is program to locate and display active DHCP servers on sub-
     net. Program sends standard DHCP discover messages. If it detects any
     unauthorized server (server not included in valid_dhcp list), it displays
     it in special way. It's also possible to display only unauthorized
     servers. Received DHCP message may be printed in short format or in full
     format with whole packet decoded.	odhcploc must be executed by user
     which has privileges to bind on port 68 (usually root).  odhcploc argu-
     ments are as follows:

     -p	     Display replies only from unauthorized servers.

     -V	     Display odhcploc version together with compiled features and
	     exit.

     -v	     Display full decoded DHCP packet.

     -c count
	     Number of discover messages to send. Default value is 1.

     -i interval
	     Wait interval seconds between sending two discover messages.
	     Default value is 30.

     my_ip   IP address of interface to use for sending discover messages.
	     This options is needed for multi-homed computers.

     valid_dhcp...
	     List of IP addresses of authorized servers.

     Program is normally terminated automatically after sending count discover
     messages with interval between two of each. It can also be terminated by
     SIGINT signal.

EXIT STATUS
     The odhcploc utility exits 0 on success, and >0 if an error occurs.

EXAMPLES
	   # odhcploc 192.168.1.218
	   22:21:08 (IP)192.168.1.218 OFFER (S)192.168.1.2 ***

SEE ALSO
     dhcpd(8) dhcpcd(8),

STANDARDS
     odhcploc implements RFC 1533 and RFC 2131.

AUTHORS
     The odhcploc utility was written by Jan Friesse
     <honzaf@users.sourceforge.net>.

BUGS
     -	 On some OS, setting of my_ip doesn't has any effect and packet is
	 still send via interface with default route/first available inter-
	 face.

BSD				 May 28, 2011				   BSD