Yes it's possible and it's exactly what I'm doing on my box.
FYI, I have a static public IP address and am using many-to-one NAT (PAT) from inside to outside network.
Authentications I tried are local, Kerberos and LDAP (so last two with Active Directory integration). All working but the AD integration really helps if you are already using user-id
It's a rather basic setup, only captive portal, no NTLM or session cookies.
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