Authenticate a public IP Linux box against a private IP Active Directory

[siigna]

Trying to figure out how to get Kerberos on Ubuntu to authenticate against an
Active Directory (Windows 2003) server.

All machines are behind a SonicWall firewall, the Linux box is in the DMZ
with public IP addresses using our ISP's DNS server.  The AD server is
behind the LAN with a private IP.

Nowhere I see has an explanation on how to configure this situation besides
placing the linux box into the LAN with the AD and using AD as the DNS
server (which would be simple, but the Linux box needs multiple public IPs
assigned to it).

The only reason I need the linux box to authenticate against AD is I have an
instance of Kerio Mail Server running, which is pulling it's user account
information from the AD, but has no way to authenticate against it.

Anyone have any hints on configuring this type of situation?
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