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1、tincManualSettingupaVirtualPrivateNetworkwithtincIvoTimmermansandGuusSliepenThisistheinfomanualfortincversion1.1pre2,aVirtualPrivateNetworkdaemon.Copyrightc1998-2011IvoTimmermans,GuusSliepenandWesselDankers.Permissionisgrantedtomakeanddistributeverbatimcop
2、iesofthismanualprovidedthecopyrightnoticeandthispermissionnoticearepreservedonallcopies.Permissionisgrantedtocopyanddistributemodifiedversionsofthismanualunderthecon-ditionsforverbatimcopying,providedthattheentireresultingderivedworkisdistributedunderthetermsofapermissionnoticeidenticaltothis
3、one.Chapter1:Introduction11IntroductionTincisaVirtualPrivateNetwork(VPN)daemonthatusestunnelingandencryptiontocreateasecureprivatenetworkbetweenhostsontheInternet.BecausethetunnelappearstotheIPlevelnetworkcodeasanormalnetworkdevice,thereisnoneedtoadaptanyexistingsoftware.Theencryptedtunnelsal
4、lowsVPNsitestoshareinformationwitheachotherovertheInternetwithoutexposinganyinformationtoothers.Thisdocumentisthemanualfortinc.Includedarechaptersonhowtoconfigureyourcomputertousetinc,aswellastheconfigurationprocessoftincitself.1.1VirtualPrivateNetworksAVirtualPrivateNetworkorVPNisanetworktha
5、tcanonlybeaccessedbyafewelectedcomputersthatparticipate.Thisgoalisachievableinmorethanjustoneway.Privatenetworkscanconsistofasinglestand-aloneEthernetLAN.Oreventwocom-putershookedupusinganull-modemcable.Inthesecases,itisobviousthatthenetworkisprivate,noonecanaccessitfromtheoutside.Butifyourco
6、mputersarelinkedtotheInternet,thenetworkisnotprivateanymore,unlessoneusesfirewallstoblockallprivatetraffic.Butthen,thereisnowaytosendprivatedatatotrustedcomputersontheotherendoftheInternet.Thisproblemcanbesolvedbyusingvirtualnetworks.Virtualnetworkscanliveontopofothernetworks,buttheyuseencaps
7、ulationtokeepusingtheirprivateaddressspacesotheydonotinterferewiththeInternet.Mostly,virtualnetworksappearlikeasingleLAN,eventhoughtheycanspantheentireworld.Butvirtualnetworkscan’tbesecuredbyusingfirewalls,becausethetrafficthatflowsthroughith
