IBM Heritage user manual Supported Dhcp client options

Heritage Series ADSL Bridge/ Router	9-7
DHCP Client Configuration

two-digit hexadecimal numbers separated by colons. For example: option option-133 "my-option-133-text";

option option-129 1:54:c9:2b:47;

Because DHCP does not know the format of these undefined option codes, no checking is done to ensure the correctness of the entered data.

9.4.2 Supported DHCP client options

The following section shows configuration options which the DHCP client can use to

configure the IP stack.

option subnet-mask ip-address;

The subnet-maskoption specifies, or requests the server to supply, the client’s subnet mask.

option dhcp-lease-time int;

This option can be used to request a specific lease duration by the client. The analogous option on the server is “max-lease-time”. For example, “send dhcp-lease-time 200” would set a client to request a lease time of 200 seconds.

option dhcp-client-identifier data-string;

This option should be used to specify a client identifier in a host declaration, so that a DHCP server can find the host record by matching against the client identifier. This option is required when attempting to operate the DHCP client with a Microsoft DHCP server. In this case, the hardware address of the card upon which DHCP is running must be sent to the server as the client-identifier. Otherwise, it is recommended that every DHCP client has at least a unique identifier (this can be a MAC address, or a text string such as a hostname)- otherwise the DHCP server may not function optimally.