VPN Tunnel to work network

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http://serverfault.com – I have an IPSec tunnel between work and home, with a pfSense firewall on both ends. The VPN works fine, although I never got DNS to work properly across sites, and I use Host Overrides in the DNS forwarder settings on both ends to be able to access remote machines by name. I only have a handful of mappings and this is managable (albeit not pretty). Now I want to set up a QNAP NAS in my home network (behind a Cisco SG300-28P 28-Port Gigabit PoE Managed Switch) that uses the QNAP RSync backup to replicate data from a QNAP NAS at work to the one in my basement. I would have preferred to use an (HowTos)