HP Aruba JL253A Management And Configuration Manual page 339

4. Right-click IPv4 and select Set Predefined Options. Select option class as the newly defined vendor class,
click ADD and enter the following information for Proxy details:
a. Name - Proxy
b. Data Type - String
c. Code - 148
d. Description - Proxy details.
Chapter 10 Zero Touch Provisioning with AirWave and Central 339