Creating a transparent bridge between remote lans with ipsec - possible?

[jpp]

What I'd like to do is create an transparent bridge between two remote lans using ipsec - it's not at all clear if this is possible with pfsense (or even if that's the best way to do what I want)

The current setup has three nodes 10.x.x.x gigabit connected server farm, 192.168.2.x and 192.168.3.x are office locations.  I have ipsec tunnels setup in a triangle and can access remote machines at the other locations.  I'd like to be able to get the various browsing protocols (smb, bonjour) working across at least the inter office tunnel - any suggestions?