Unfortunately you are unable to set a static lease for an SSL VPN user like in L2TP, PPTP and Cisco VPN at this time. It is a very good suggestion however, one that has already been suggested, I'd advise you pushing your vote onto it!
Is it possible to do something like this in Sophos XG ? Using a virtual Lan ip adress with SNAT and DNAT seems to be a clever workaround, but i find no way to specify the equivalent to "user network" in XG.
