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I have had several requests for "router basics". This tutorial will show you how to translate your internal network into a single public ip address. Translating several internal or private addresses is called port address translation or PAT.
"PAT, or overloading, is a feature of Cisco IOS NAT and can be used to translate "internal" (inside local) private addresses to one or more "outside" (inside global, usually registered) IP addresses. Unique source port numbers on each translation are used to distinguish between the conversations. With NAT overload, a translation table entry containing full address and source port information is created." – Cisco.com
Here are the basics of PAT configuration
router(config-if)#ip nat inside
router(config-if)#ip nat outside
router(config)#access-list 10 permit 10.100.100.0 0.0.0.255
router(config)#ip nat inside source list 10 interface f1/0 overload