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Environment/Versions DHCP option 42 DHCP option 50 DHCP option 61 DHCP option 119 Answer Under the DHCP tab of the client, you can edit or add an additional custom option. Option 42 - NTP Note that this field just requires the IP address. In this case 10.1.0.1 is represented in hex 0a010001 Option 50 - Request a Specific IP Address   Option 61 - Client Unique Identifier   Option 119 - Domain Search Note that this field needs additional values that represent the length of each string and a termination of 00. You may want to check the specs or other sources Below is an example for domain spirent.com. option 119 should be set to hex and use 0773706972656e7403636f6d00 The break down of 0773706972656e7403636f6d00 is: 07 (7characters, spirent) hex conversion of spirent = 73706972656e74 03 (3 characters, com) hex conversion of com = 636f6d 00 (represents the end)