Unified Authentication between Windows AD and Linux LDAP Server

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http://serverfault.com – Does anyone know of a solution that would allow me to do user account synchronization between Windows Active Directory and an LDAP Server hosted on a Linux Server? I'm currently looking at FreeIPA (www.freeIPA.org) and 389DS (http://directory.fedoraproject.org). I'm looking to do account synchronization because the AD server is being deployed at our HQ which is not hardened (no generator backing and only 1 internet connection) whereas the Linux LDAP server is being deployed into a hardened datacenter. All the machines in the datacenter are Linux based and 90% of the machines at HQ are Windows (HowTos)