DHCP Option 61 (Client Identifier)
Note
Only valid for EtherNet/IP devices
The DHCP Option 61 (Client Identifier) allows the end-user to specify a unique identifier, which has to be unique within the DHCP domain.
Attribute #22 (DHCP Option 61 source) is used to configure the source of the Client Identifier. The table below shows the definition for the Client identifier for different sources and their description.
Value | Source | Description |
|---|---|---|
0 | Disable | The DHCP Option 61 is disabled. This is the default value if the attribute is not implemented in the application. |
1 | MACID | The MACID will be used as the Client Identifier |
2 | Host Name | The configured Host Name will be used as the Client Identifier |
3 | Generic String | Attribute #23 will be used as the Client Identifier |
Attribute #23 (DHCP Option 61 generic string) is used to set the Client Identifer when Attribute #22 has been set to 3 (Generic String). Attribute #23 contains the Type field and Client Identifier and shall comply with the definitions in RFC 2132. The allowed max length that can be passed to the module via attribute #23 is 64 octets.
Example:
If Attribute #22 has been set to 3 (Generic String) and Attribute #23 contains 0x01, 0x00, 0x30, 0x11, 0x33, 0x44, 0x55, the Client Identifier will be represented as an Ethernet Media Type with MACID 00:30:11:33:44:55.
Example 2:
If Attribute #22 has been set to 2 (Host Name) Attribute #23 will be ignored and the Client Identifier will be the same as the configured Host Name.