118
3‐7NAT
NetworkaddresstranslationssolvetheproblemifsharingasingleIPaddresstomultiple
computers.WithoutNAT,allcomputersmustbeassignedwithavalidInternetIPaddressto
getconnectedtoInternet,butInternetserviceprovidersonlyprovideveryfewIPaddresses
toeveryuser.Thereforeit’s
necessarytouseNATtechnologytoshareasingleInternetIP
addresstomultiplecomputersonlocalnetwork,soeveryonecangetconnectedto
Internet.
ThisbroadbandroutersupportsfourtypesofNATfunctions,andtheinstructionsofthese
functionswillbegivenbelow.