Option specifics are exlained in RFC
http://www.networksorcery.com/enp/rfc/rfc3495.txt
From RFC
±-----±-------±---------------±---------------±–±---------------+
| 122 | Length | Sub-option 1 | Sub-option 2 |-----| Sub-option n |
±-----±-------±---------------±---------------±–±---------------+
±------------------±-------±-----------------------+
| Sub-option Code | Length | Sub-option information |
±------------------±-------±-----------------------+
You need to write this information as hexadecimal value into dhcp options configuration