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# FAQ-- how to configure option 43 in Microsoft DHCP Server in wlan

Publication Date:  2015-06-26 Views:  2318 Downloads:  0
Issue Description

Customer said when configure option 43 in Microsoft DHCP server, the AP could get ip address, but it could join AC. while when configure static ip address, it could join AC.

Solution

After checking the configuration of option 43, it is wrong. The rule for option 43 is the following:

(1)     If AC ip add is 192.168.22.1then it should fill in: 030C3139322E3136382E32322E31. 03 is a fixed valuewhich represents Option 43 sub option typehexadecimal 0C“0C”equals to decimal “12”represents the length of AC ip add that includes decimal point. Hexadecimal '31' represents decimal '1', and Hexadecimal'2E'represents decimal point '.',then calculate as this, 3139322E3136382E32322E31 represents '192.168.22.1'.

(2)      besides, if there relates to several ACs, option 43 will be filled in several ip add (eg:HSB), ip add should be separated with ",", the Hexadecimal is '2C'. for example: master and standby AC ip are 192.168.100.2 and 192.168.100.3, then option 43 should be : 031B3139322E3136382E3130302E322C3139322E3136382E3130302E33. '03' is a fixed value,'1B'(equals to decimal “27”) represents the length of two ip (including ','and '.').then '031B3139322E3136382E3130302E322C3139322E3136382E3130302E33' is '192.168.100.2,192.168.100.3'.

(3)     In the scope options , just write in Binary box , then ASCII is created automatically.

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