We have ASA with base license, I can only have 2 vlan and a DMZ, these interfaces are already occupied, is required to have a remote access VPN, the VPN settings these remote clients must have a different address, my question is that whether the limitation of the vlan we can do?
But it seems to me that you think you need another Vlan interface for the VPN? This is not the case. The VPN connection will be formed to the Vlan interface with the connection to the external network. The VPN Clients will get IP addresses from a VPN address pool. These addresses will be visible in the routing table of the ASA from behind the external interface where they connected from.
With the Base License only your users can have 2 AnyConnect VPN Client or Clientless VPN connections. If you use the old IPsec VPN Client then you will be able to have 10 concurrent VPN Client connections.