I finally got my second m0n0wall device (m1n1wall from Netgate) setup, and I tried to access it remotely from a tunnelled vnc connection, but I'm not getting any response from the https server. Grrr.
racoon ERROR: give up to get IPsec-SA due to time up to wait
For me, this was a subnet misconfiguration. I had 192.168.0.1/24 instead of 192.168.0.0/24. Could have been some other glitchy things I was screwing around with, but the beautiful thing is that it works!
Connecting two separate LANs over a VPN is super cool. I'm really liking it, and have plans to do a whole lot more. I can see how useful this type of setup can be. This will fit very nicely into the modularization efforts I'm working on.