35.1. DHCP resource

35.1. DHCP resource
	Chapter 35. DHCP - Dynamic Host Configuration Protocol

The Abilis DHCP module implements three working modes:

BOOTP relay agent (Relay mode): internet host or router that passes DHCP messages between DHCP clients and DHCP servers.
DHCP Server: internet host that returns configuration parameters to DHCP clients.
DHCP Client: internet host which retrieves configuration parameters from a server.

35.1.1. Activating DHCP resource

Add the resource to the Abilis system with the following command.

[17:14:59] ABILIS_CPX:a res:dhcp

RES:DHCP ALREADY EXISTS

The DHCP resource may already exist in the system, but may not yet be active: set it active with the command:

[17:15:17] ABILIS_CPX:s act res:dhcp

COMMAND EXECUTED

	Caution
	After adding or setting the DHCP active, you must restart the Abilis to make the resource running (use the command warm start to reboot the Abilis).

[17:14:59] ABILIS_CPX:s p dhcp act:yes

COMMAND EXECUTED

[17:15:17] ABILIS_CPX:d p dhcp

RES:Dhcp - Not Saved (SAVE CONF), Not Refreshed (INIT) ------------------------
       ------------------------------------------------------------------------
Run    DESCR:Dynamic_Host_Configuration_Protocol
       LOG:DS           ACT:YES       srv-udp-locport:67   cli-udp-locport:68
       msg-len:1472     TOS:0-N
       WDIR:C:\APP\DHCP\
       - Server ---------------------------------------------------------------
       max-clients:300

35.1.2. DHCP resource parameters

Use the following command to display the parameters of the resource; by typing d p dhcp ? command, the meaning of all parameters is shown.

[17:15:17] ABILIS_CPX:d p dhcp

RES:Dhcp ----------------------------------------------------------------------
Run    DESCR:Dynamic_Host_Configuration_Protocol
       LOG:DS           ACT:YES       srv-udp-locport:67   cli-udp-locport:68
       msg-len:1472     TOS:0-N
       WDIR:C:\APP\DHCP\
       - Server ---------------------------------------------------------------
       max-clients:300

Meaning of the most important parameters:

LOG: Logging functionalities activation/deactivation.
ACT: Operation activation [NO, YES].
srv-udp-locport: Server side UDP port [default is 67].
cli-udp-port: Client side UDP port [default is 68].
msg-len: Maximum length of DHCP message, actually the UDP payload [548..2048];
WDIR: Selects the directory where DHCP.BND (BND stays for binding) file are stored. Full path with drive letter ['C'..'Z'] terminated by '\'. Max 128 chars. Spaces require double quotes (E.g. "C:\My dir\"). A binding is a collection of configuration parameters, including at least an IP address, associated with or “bound to” a DHCP client. Bindings are managed by DHCP servers.
max-clients: Maximum number of serviceable clients [100..1000].

The following command allows the administrator to change the configuration of the resource:

s p dhcp parameter:value...

	Caution
	To activate the changes made on the upper case parameters, execute the initialization command init res:dhcp; while to set act the changes made on the lowercase parameters a save conf and an Abilis restart are required (i.e. With warm start command).


Chapter 35. DHCP - Dynamic Host Configuration Protocol		35.2. DHCP Relay Mode