Quote from: oscarzululondon on July 02, 2012, 11:08 pmA firewall doesn't hurt, although your router should have one anyway.Careful with this. A lot, though certainly not all, of ADSL/cable modem-routers aren't really running as a firewall. In a lot of cases they're just running NAT with port-forwarding if there's a server present.Systems on the LAN are effectively protected because connections initiated by an external host are not recognised by the NAT routing and don't go beyond the WAN IP. It is an unintended consequence of using NAT, which was only ever implemented as a kludge to try to make IPv4 addresses last longer.With a firewall you want something with at least the capabilities of IPTables (which a lot of commercial products are based on anyway).