Cable/DSL router or access point

• Demonstration router:  Linksys WRT54G Wireless-G Broadband Router
• Linksys WRT54G Quick Install document (PDF file, 189KB)
• Network Address Translation (NAT)
  • Usually means Port Address Translation (PAT): multiple inside computers with one outside address
    • See PAT, Figure A in TechRepublic Cisco article
    • PAT is also known as Network Address Port Translation (NAPT), Overloaded NAT, Internet Connection Sharing, and IP Masquerading
  • Public vs. Private IP Addresses
  • NAT's simple firewall function
  • Technical:  The Trouble with NAT (Cisco Internet Protocol Journal)
    (see especially Fig. 3 NAPT illustration)
• Port forwarding
  • Linksys WRT54G port forwarding
  • Specific program ports on the WRT54G