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IP security (IPSec) is a suite of cryptography-based protection services and security protocols. Because it requires no changes to applications or protocols, you can easily deploy IPSec for existing networks. The Windows XP Professional implementation of IPSec is based on industry standards developed by the Internet Engineering Task Force (IETF) IPSec working group. IPSec provides computer-level authentication, as well as data encryption, for L2TP-based VPN connections. IPSec provides per-packet data authentication (proof that the data was sent by the authorized user), data integrity (proof that the data was not modified in transit), replay protection (prevention from resending a stream of captured packets), and data confidentiality (captured packets cannot be interpreted without the encryption key). In contrast, PPTP provides only per-packet data confidentiality. IPSec negotiates a secure connection between your computer and the VPN server before an L2TP connection is established, which secures user names, passwords, and data.

Because the DSL connection works over the phone line, the connection belongs to you alone (there is no sharing with other users as with cable Internet access), and the connection is always available there is no phone number to dial (although you might periodically have to re-establish a client PPPoE connection for more information, see What Is PPPoE on page 105) Data transfer occurs automatically over the line to the DSL provider Sound too good to be true Well, for many people it is The biggest problem with DSL is that you must have a DSL provider in your area, and you must live within a certain distance of that provider s offices DSL traffic can only travel a certain distance before degrading, so even though your phone company provides DSL, you still might not qualify, depending on how far away you live.

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IPSec encryption does not rely on the PPP authentication method to provide initial encryption keys. Therefore, L2TP connections use all standard PPP-based authentication protocols such as EAP-TLS, MS-CHAPv2, MS-CHAP, EAP-MD5, CHAP, SPAP, and PAP to authenticate the user after the secure IPSec communication is established. However, the use of EAP-TLS or MS-CHAPv2 is recommended. Encryption is determined by the IPSec security association (SA). An SA is a combination of a destination address, security protocol, and unique identification value, called a Security Parameters Index (SPI). The available encryptions include:

Data Encryption Standard (DES), which uses a 56-bit key. Triple DES (3DES), which uses three 56-bit keys. It is designed specifically for high-security environments.

Additionally, although DSL connections are not shared, they are often bandwidth-limited, requiring that you pay a higher monthly cost if you want to match the maximum throughput of cable Internet connections Table 4-2 summarizes the characteristics of DSL Internet If DSL is available in your area, it is an excellent broadband solution You can find out if DSL service is available in your area by checking your local Yellow Pages or your local phone company s Web site(s), or by searching for the service online Try wwwdslreportscom for help locating providers in your area..