Adding additional DHCP options
You can configure the Option Code, Type, and Hexadecimal Value in SSID profiles when DHCP Server is enabled.
To add additional DHCP options:
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Go to AP Manager.
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In the tree menu, go to WiFi Profiles > SSID. The SSID pane opens.
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Create a new SSID profile, or double-click a profile in the list to edit it.
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Ensure DHCP Server is enabled.
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Expand Advanced.
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In the Additional DHCP Options menu, click Create New. The Create New Options dialog opens.
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Configure the additional DHCP options.
Option Code Enter the option code. Type Select HEX, String, IP, or FQDN Value Enter the corresponding hexadecimal value. 
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Click OK.