Hey. I'm new to this community. I work for a WISP, and we are using NAT for all our customers. Our head tech who installed a cisco 4500 router, a pix firewall, and a 5000 catalyst switch, has just left(did not give any notice, have not heard from him since). It was pretty much him and myself running the whole network. I dont have a lot of cisco experience and i would like to get rid of all(old and used, have been buggy) of it and just have a linux box for routing/firewall, email(postfix), and apache. I also need to setup a backup plan because there is nothing in use at the moment. I heard rsync does replication so I think that will work. The only thing I need to figure out how to do is assign static public ip's, to internal ip's. There are a few customers that want outside addresses.

I would appreciate any advice on how to setup everything as simple as possible. The owner is a good friend's dad, and he is starting up this WISP but has no computer knowledge.(phone guy) I will be leaving next fall to go to school and they want a setup that will be redundant so by the time i leave they should be able to backup the server no problem. It is hard to find qualified techs around here, and I am afraid when I leave they wont be able to run everything.

Thanks.