Replacing ISA server looking for "link translation"
I'm looking to use pfsense to replace an ageing ISA server installation. The ISA server handles incoming traffic to a fixed IP address with DNS for various subdomains handled by an external ISP. We also make some use of ISA's link translation such that
Will pfsense or associated/supported packages do this and if so how (or what specific documentation should I be reading / keywords should I be searching for).
Thanks in advance. Apologies if this is a newbie question with obvious answer - I have looked but failed to find anything of much use.