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