Has anybody got some experience with alternative router/firewall software (excluding pfsense and also exluding DD-WRT/Open WRT/Tomato)? I have followed mirimir's magnificent (thank you for you effort!) guide and a comprehensive guide that could be found on AIRVPN forum regarding pfsense (in essence what I have done is setting up a pfsense VM to host a VPN client and route traffic to another Linux VM from it). I was wondering about adding another layer of a VM-firewall to my setup beside pfsense (preferably Linux-based small footprint firewall distro as I'd like its firewall to be based on netfilter architecture, like Untangle; there just seems to be so little choice). Has anybody got some experience, suggestions?