wouldn't this be as easy as simply putting another wireless broadband router on your lan?
eg:
your lan is 192.168.0.x
router is 1, server is 2, etc
get another broadband router, make it:
192.168.1.1 and its gateway (wan side) 192.168.0.1 (your lan router)
this will work fine
then enable authentication on the wireless
job done!
OK, its a lot less complicated than what you wanted, but its easy and the guests will have no lan access, and they will have internet, and they will need to authenticate (ising WEP or WPA). You could change the wireless password once a week perhaps.
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