Specifications

September 08, 2010 Page 1 of 18
Configuring Network Address Translation (NAT)
Thisdocumentprovidesthe followinginformationaboutconfiguringNetworkAddress
TranslationontheEnterasysMatrix
®
N‐SeriesandtheEnterasysS‐Series
®
platforms.
What is Network Address Translation?
NetworkAddressTran slation(NAT)andNetworkAddressPortTranslation(NAPT)aremethods
ofconcealingasetofhostaddressesonaprivatenetworkbehindapoolofpublicaddresses.
TogethertheyarereferredtoastraditionalNAT.AtraditionalNAT configurationismadeupofa
privatenetworkandapublic
networkthatareconnectedbyarouterwithNATenabledonit.
BasicNATisamethodbywhichIPaddressesaremappedfromonegroupofaddressesto
another,transparenttotheenduser.AbasicNATtranslation isalwaysbetweenasingleprivat e IP
addressandasingle
publicIPaddress.
NAPTisamethodbywhichmanyprivatenetworkaddresses,alongwitheachprivateaddress’
associatedTCP/UDPport,aretranslatedintoasinglepublicnetworkaddressanditsassociated
TCP/UDPports.GiventhatthereisonlyasinglepublicIPaddressassociatedwiththe
translations,itisthe
publicporttheprivateaddressanditsportareassociatedwiththatallowsfor
theuniquenessofeachtranslation.
Inaddition,thefollowingfeaturesarealsosupported:
•StaticandDynamicNATPoolBinding
•FTP,DNS,andICMP(withfivedifferenterrormessages)softwarepathNATtranslation
For information about... Refer to page...
What is Network Address Translation? 1
Why Would I Use NAT in My Network? 2
How Can I Implement NAT? 2
NAT Overview 3
Configuring NAT 9
NAT Configuration Examples 12
Terms and Definitions 17