dhcp_relay(1M)							dhcp_relay(1M)

NAME    [Toc]    [Back]

     dhcp_relay	- proclaim relay-agent for Dynamic Host	Configuration Protocol

SYNOPSIS    [Toc]    [Back]

     /usr/etc/dhcp_relay [ -f ]	[ -o relay_options_file	]

DESCRIPTION    [Toc]    [Back]

     dhcp_relay	is the relay-agent that	communicates with other	DHCP and
     proclaim clients and servers to provide address-leases across networks
     using DHCP	messages.  The format of DHCP messages is based	on BOOTP
     messages (see RFC 951).  A	detailed protocol specification	for DHCP is
     contained in RFC 1541, available from the Network Information Center.

     The DHCP relay-agent receives service requests at the UDP port indicated
     in	the bootp service description contained	in the file /etc/services (see
     services(4)).

     dhcp_relay	replaces the standard bootp(1M)	server application and serves
     both bootp	and DHCP clients.  The -f option on the	command	line enables
     the forwarding function of	bootp(1M).

CONFIGURATION    [Toc]    [Back]

     dhcp_relay	execution can be controlled through the	following steps.

     1)	 Specify relay-agent options in	the /etc/config/dhcp_relay.options
	 file, if any, as in this example:
	 -c proclaim_config_dir
	 This specifies	an optional proclaim server configuration directory.
	 The default directory is /var/dhcp/config.

     2)	 The configuration directory contains a	file dhcp_relay.servers, which
	 has a list of proclaim	servers, one per line.	DHCP messages are
	 forwarded to each server contained in this file.  Proclaim servers
	 may be	specified using	either an Internet host	name or	an Internet
	 address in standard dot notation (see inet(3N)).  Here	is a sample
	 dhcp_relay.servers configuration file:
	 192.26.61.9
	 dhcpserver.sgi.com

     3)	 Enable	the proclaim relay-agent by entering these commands:
	 chkconfig proclaim_relayagent on
	 chkconfig proclaim_server off

     4)	 Replace the "bootp" entry in /usr/etc/inetd.conf with this line:
	 bootp dgram udp wait root /usr/etc/dhcp_relay dhcp_relay -o \
	      /etc/config/dhcp_relay.options

     5)	 Kill any running bootp	with this command:
	 /etc/killall bootp





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dhcp_relay(1M)							dhcp_relay(1M)



     6)	 Restart inetd with this command:
	 /etc/killall -HUP inetd

FILES    [Toc]    [Back]

     /etc/config/dhcp_relay.options
     /etc/hosts
     /etc/ethers
     /usr/etc/inetd.conf
     /var/dhcp/etherToIP
     /var/dhcp/config/dhcp_relay.servers

SEE ALSO    [Toc]    [Back]

     bootp(1M),	chkconfig(1M), dhcp_bootp(1M), inetd(1M), proclaim(1M),
     ProclaimRelayMgr(1M), syslogd(1M),	ethers(4), hosts(4).

     IETF RFCs 1541, 1533, 1534, 1535.


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