2.2.1.2.5.2 Representing a DHCPv4 Client Unique ID
When the DHCP_CLIENT_UID (section 2.2.1.2.5) structure is used to represent a DHCPv4 client unique ID, the latter is stored in the Data field of the structure in the following format:
|
Bytes |
Description |
|---|---|
|
0–3 |
DHCPv4 Subnet ID. It can be calculated by doing a binary AND of the IP address of the DHCPv4 client and the subnet mask. |
|
4 |
Hardware type. This value is always 0x01. |
|
variable |
Consider a DHCP_CLIENT_UID that represents the following:
DHCPv4 Subnet ID is 192.168.1.0
The hardware address of the DHCPv4 client-identifier is: 00-1c-25-80-a0-43
The contents of the Data field of the DHCP_CLIENT_UID will be as follows:
|
Bytes |
Values |
|---|---|
|
0–3 |
0x00, 0x01, 0xa8, 0xc0 |
|
4 |
0x01 |
|
5–10 |
0x00, 0x1c, 0x25, 0x80, 0xa0, 0x43 |