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Microsoft Windows Server 2008: A Beginner s Guide
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PPP is built upon two other protocols, the Link Control Protocol (LCP) for handling the connections and authentication, and the Network Control Protocol (NCP) for handling the compression and encapsulation The TCP/IP networking protocol determines the properties of NCP and how it does its job PPP defines the building of a frame that takes the datagram built at the third or Networking layer of the OSI model (see 5, IP under Networking Protocols ), compresses and encapsulates it, and adds address and control information, so it looks like this:
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Starting and ending delimiters mark the start and end of the frame Address is the destination address Frame control is a sequence number to maintain the proper order Network protocol is the protocol (IP) being used Data is the actual datagram being transferred FCS is the frame check sequence used for error checking
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In PPP, LCP establishes the connection between the server and the client and then negotiates between the two computers to determine the type of authentication to be used, as well as several of the link parameters, such as the maximum frame length NCP is used to determine the networking protocol to be used and then, based on that, how the datagram will be compressed and encapsulated Although PPP has a prominent role in authentication, it doesn t actually carry out the authentication; that function is performed by one of several authentication protocols VPN and Windows Server 2008 have several authentication protocol options, each with several variants The two recommended are: Microsoft Challenge Handshake Authentication Protocol version 2 (MS-CHAP v2) Extensible Authentication Protocol-Transport Level Security (EAP-TLS)
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Challenge Handshake Authentication Protocol CHAP, the most common and widely supported of the primary authentication methods, depends on using a password known to both the client and the server in the authentication (CHAP is defined in several RFCs, primarily 1994) Unlike in earlier authentication methods, though, the password is not transmitted during authentication Instead, the server sends out a unique string of characters called the challenge string The client uses its password and the challenge string to compute a Message Digest hash and send it back to the server The server also computes the hash according to its knowledge of the password and the string it sent and compares that hash to the one sent by the client If the two hashes are the same, the client is authenticated A hash is an algorithm or function that is very easy to calculate if you know the originating data, but it is very difficult if not impossible to compute the data from the hash
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Virtual Private Networking
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Microsoft has developed two variants of CHAP: MS-CHAP and MS-CHAP v2, which are designed to work with Windows 9x through Vista, as well as with Windows Server 2003 and 2008, and are what is used with VPN MS-CHAP primarily differs from CHAP by using a different Message Digest hash algorithm, by encrypting the challenge and the response, and by not requiring that the password be stored in a reversibly encrypted form MS-CHAP v2 primarily differs from MS-CHAP by being more secure with stronger encryption keys, by authenticating both the client to the server (as in CHAP and MS-CHAP) and the server to the client, and by providing separate encryption keys for sending and receiving information Extensible Authentication Protocol If in place of a password, a smart card or other device is used for identification, then EAP is used for authentication EAP, which is a networking standard defined in RFC 2284, is a general framework that allows an arbitrary authentication method to be negotiated and used With Windows Server 2008, VPN, and smart cards, EAP-TLS (Transport Layer Security) is the protocol of choice EAP-TLS causes certificates stored both on the server and on a smart card at the client to be exchanged, and, if the certificates are accepted, to authenticate both the client and the server In the process, shared encryption keys can be exchanged, as well as other information EAP-TLS provides a very high level of mutual authentication
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