Network Address Translation I

• Single IP address on Internet side (assigned by ISP) + port numbers

• Reserved, non-Internet IP addresses on LAN side

• NAT translates public IP address + port to/fromLAN-side IP address + (possibly different) port

• LAN-side addresses can be static, or assigned by Dynamic Host Configuration Protocol (DHCP)

• Centralizes security issues

• Hides your computers from the Internet

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