I have several ASA 5505 and 5510. I understand that I can create a redundant ISP connection to the ASA using two of the ethernet ports. What I would like to know is whether I can create a new port utilizing a USB Internet stick and route to this in the event of an ISP failure. Specifically on my ASA 5505's as they are utilizing EZ-VPN tunnels. My 5510 is behind a load balancer working fine.