Assign Public WAN IP to SSL VPN SonicWall

Hi guys,

Does anyone have a guide on assigning a public IP, separate from the primary WAN IP, to the SSL VPN on a SonicWall?

Example, current Primary WAN IP ends in .172. which is a static one on wan interface.

I want SSL VPN users to come in  on.Secondary WAN IP of .171 using https 443, instead of .10:4433

I saw a thread on here but it seemed to go nowhere.

any suggestions /recommendations 

would be highly appreciate it

thanks