Why Use NAT? Why Use NAT?

• One of the main functions of NAT is to enable private IP networks to connect to the Internet.
• Security—Keeping internal IP addresses hidden discourages direct attacks.
• IP routing solutions—Overlapping IP addresses are not a problem when you use NAT.
• Flexibility—You can change internal IP addressing schemes without affecting the public addresses available externally; for example, for a server accessible to the Internet, you can maintain a fixed IP address for Internet use, but internally, you can change the server address.