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Each year 1.5 million shelter animals are euthanized (670,000 dogs and 860,000 cats). Source: ASPCA. The solution is not to shelter unwanted pets, but to SHUT DOWN THE PET MILLS. Anyone who wants a pet will just have to adapt a great pet from a shelter.

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:
• Network Management Components - The Basics of an Effective Management Strategy
• Network Maintenance
• Network Change Control System
• Everything You Need To Know About LAN Backbone Cabling
• Troubleshooting the Intermediate System to Intermediate System (IS-IS) Protocol
• How to Choose Work Area Network Cable Faceplate Locations
• Creating a Backup Plan
• Network Schematic Symbols
• Questions to Ask Before Beginning Network Design
• What is Structured Cabling for LANs (Local Area Networks)?

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