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Victims of Sandy Hook

Stop the Slaughter of Innocents. Congress is bought and paid for by gun lunatics and gun promotion groups. If you want to live in a safe America, help buy Congress back for America. Send a donation to Mayors Against Illegal Guns, 909 Third Avenue, 15th Floor New York, NY 10022

What is the Difference Between NAT and PAT?

The main purpose for NAT (Network Address Translation) is to hide internal network IP addresses from the external Internet for security reasons. It works by mapping a pool of public IP addresses one-to-one to the private internal IP addresses, keeping the port number intact.

Internal AddressExternal Address
10.10.10.1:8063.63.63.1:8000
10.10.10.2:8063.63.63.1:8001
10.10.10.3:8063.63.63.1:8002
10.10.10.4:8063.63.63.1:8003

A port number identifies a specific protocol or process on a host to which a message or datagram is to be delivered. PAT (Port Address Translation) uses a single public IP address and maps multiple inside addresses to it by using different port numbers.

Most routers actually use NAPT (Network Address and Port Translation), which translates not only IP addresses, but also TCP and UDP port numbers.

An additional advantage of NAT is that by allowing multiple computers to connect to the Internet through a single external IP address it reduces the cost for connecting to the Internet. It also helped to extend the life of dwindling number of IPv4 addresses until IPv6 could be implemented.

More Network Troubleshooting and Support Articles:
• How to Connect a Wireless Router
• Network Cabling Do's and Don'ts
• Calculating VoIP Bandwidth
• Configuring DHCP for Your SME Network
• Letting Your SME Users Access the Internet
• Internet Access Methods for Your SME
• Basics of RAID
• Brainstorming to Collect Data in Designing the Corporate Computer Network
• Remote Connectivity
• Troubleshooting the Intermediate System to Intermediate System (IS-IS) Protocol

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