Can anyone help me with IP addressing or link to a decent tutorial in simple terms. My Set-up: I have a wireless router/modem connected to broadband. Both LAN PCs and a wireless laptop connect to internet successfully- WPA enabled. Each PC has, in addition, its own s/w firewall and AV. (Norton I.S. 2005) My Problem: I want to permit the PCs to access each other (shared folders, printers scanner, etc, etc). 1. If I set access for a certain PC (lets say 192.168.1.1), can someone on the internet masquerade as that IP address and access my computer. 2. If I turn my computers on in a different order, are the IP addresses the other way round if auto assigned. 3. Should I therefore manually assign an IP address? 4. Are IP addresses for home networks different and hence safe from those on the internet? 5. Am I totally stupid or is this just the most confusing subject in the world. I have tried to read through some tutorials, but I'm struggling here folks. Thanks in advance for any help.