For a customer office to establish a VPN tunnel, a connection must first be made to the Internet. This Internet access can be to a local or national ISP. The decision of which to use should be based on individual user and site requirements. If a user is known to travel, an ISP that supports national "local" number dialing should be chosen. A fixed location can benefit from dedicated ISP access, such as ISDN, DSL, or cable modem.
The newer broadband access methods, such as DSL and cable modems, do not currently have ubiquitous coverage in the U.S. It is highly recommended that each site manager verify service availability prior to implementation planning and equipment procurement.
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