Well seeing as we have done this with the closed source alternative (PIX here)
It was time to do the decent thing and do an open source version...so here we go..
Diagram of the lab:
Basic setup of the lab:
Part two of the setup:
This is the juicy bit, where we setup VRRP, then Clustering and finally, IPsec site to site VPN. (There is some NAT in there too!:)
This is where I try and break it!
As ever enjoy! and let me know what you think :)