From: gladston@br.ibm.com
Date: Wed Aug 18 2004 - 10:30:39 GMT-3
Brian,
Does the IOS takes the broadcast request on all LANs and forward it as a unicast to the address configured?
Reading the doc CD about this command I could not find a clue about this usage;
and it is a global command.
ip dhcp-server
To specify which Dynamic Host Configuration Protocol (DHCP) servers to use on your network, or to specify the IP address of one or more DHCP servers available on the network, use the ip dhcp-server command in global configuration mode. To remove a DHCP server IP address, use the no form of this command.
ip dhcp-server [ip-address | name]
no ip dhcp-server [ip-address | name]
Syntax Description
ip-address
(Optional) IP address of a DHCP server.
name
(Optional) Name of a DHCP server.
Defaults
The IP limited broadcast address of 255.255.255.255 is used for transactions if no DHCP server is specified. This default allows automatic detection of DHCP servers.
Command Modes
Global configuration
Command History
Release Modification
11.0
This command was introduced.
Usage Guidelines
A DHCP server temporarily allocates network addresses to clients through the access server on an as-needed basis. While the client is active, the address is automatically renewed in a minimum of 20-minute increments. When the user terminates the session, the interface connection is terminated so that network resources can be quickly reused. You can specify up to ten servers on the network.
In normal situations, if a SLIP or PPP session fails (for example, if a modem line disconnects), the allocated address will be reserved temporarily to preserve the same IP address for the client when dialed back into the server. This way, the session that was accidentally terminated can often be resumed.
To use the DHCP proxy-client feature, enable your access server to be a proxy-client on asynchronous interfaces by using the ip address-pool dhcp-proxy-client command. If you want to specify which DHCP servers are used on your network, use the ip dhcp-server command to define up to ten specific DHCP servers.
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Note To facilitate transmission, configure intermediary routers (or access servers with router functionality) to use an IP helper address whenever the DHCP server is not on the local LAN and the access server is using broadcasts to interact with the DHCP server. Refer to the chapters about configuring IP addressing in the Cisco IOS IP Configuration Guide.
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The ip address-pool dhcp-proxy-client command initializes proxy-client status to all interfaces defined as asynchronous on the access server. To selectively disable proxy-client status on a single asynchronous interface, use the no peer default ip address interface command.
Examples
The following command specifies a DHCP server with the IP address of 172.24.13.81:
ip dhcp-server 172.24.13.81
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