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Protocols Used by Routing And Remote Access
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There are two general types of protocols that you must be familiar with to work with Routing And Remote Access: remote access (or line) protocols and network transport (or LAN) protocols.
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Remote Access Protocols
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Remote access protocols govern how information is formatted and transmitted over wide area network (WAN) connections, of which a dial-up connection is one type. Routing And Remote Access supports four remote access protocols:
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Point-to-Point Protocol (PPP) By far the most common remote access proto col in use today. Most dial-in servers, including Routing And Remote Access, support PPP, and it is generally considered to be the best choice for remote access situations. Routing And Remote Access supports PPP for both dial-out and dial-in connections.
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Serial Line Internet Protocol (SLIP) An older protocol developed in UNIX and still in wide use today. Routing And Remote Access supports SLIP in dial-out configurations, but you cannot use a SLIP client to dial in to an Routing And Remote Access server. RAS Protocol Used to support the NetBIOS naming convention and is a propri etary protocol, used only between Microsoft-based networks. It is required to support NetBIOS naming and is installed by default when you install the Routing And Remote Access server. NetBIOS Gateway Used to provide compatibility with older versions of Routing And Remote Access server that do not support networking protocols such as TCP/ IP. The NetBIOS gateway is used to translate data from the NetBIOS Extended User Interface (NetBEUI) protocol to these other protocols.
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Remember the access protocols and what they are used for. PPP is by far the most common; the others are run only under special circumstances. Also remember that PPP allows both dial-in and dial-out access, while SLIP allows only dial-out access (for use in leg acy servers).
Remote Access Security
Remote access has always been considered one of the weaker points of networking security. Although it s fairly easy to secure a network from unauthorized physical access, the current popularity of Internet access and remote user access places larger security demands on the modern network. Fortunately, new security technologies and protocols have been developed that ease the problem of remote access security.
Security Through User Authentication
The primary method of securing a remote access connection involves authenticating the user trying to connect. To do this, the user (or the user s client computer) must present some sort of credentials that allow the Routing And Remote Access server to verify that the user is indeed a valid user. Windows Server 2003 supports five different user authentication protocols:
Password Authentication Protocol (PAP) The most basic form of user authentication. A user s name and password are transmitted over the dial-up con nection to the Routing And Remote Access server. This information is transmitted in clear text with no encryption, making it quite vulnerable to snooping. In addi tion, PAP provides no way for a client and a server to authenticate one another. For the most part, the availability of better authentication protocols is rendering PAP obsolete. In fact, Microsoft recommends that you not use it unless absolutely necessary.
Lesson 4
Remote Access Overview
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Shiva Password Authentication Protocol (SPAP) Shiva is a private company (now owned by Intel) that manufactures remote access hardware devices. SPAP is included mainly for compatibility with these devices and really isn t used much on most networks. SPAP offers weak encryption of authentication credentials, but no encryption of data. You should not rely on it when strong encryption is a requirement. Challenge Handshake Authentication Protocol (CHAP) This form of authentication is considerably more secure than PAP or SPAP. The server sends the client a challenge and the client uses its credentials to encrypt the challenge. This encrypted information is then sent across the dial-up connection to the server, which decrypts it and attempts to validate the user. If the outcome matches the challenge, the user is authenticated. Since the challenge and response are encrypted, they are considerably less vulnerable to eavesdroppers. CHAP is also commonly referred to as MD5-CHAP because it uses the RSA MD5 hash algorithm for encryption. Microsoft CHAP (MS-CHAP) A modified version of CHAP that allows the use of Windows Server 2003 authentication information. There are two versions of MS-CHAP. Version 2 is the most secure and is supported only by Windows 2000, Windows Server 2003, and Windows XP. Version 1 is supported by earlier versions of Windows and other operating systems. Extensible Authentication Protocol (EAP) A general protocol for PPP authentication that supports multiple authentication mechanisms. Instead of selecting a single authentication method for a connection, EAP can negotiate an authentication method at connect time. The computer asking for the authentica tion method is called the authenticator and may require several different pieces of authentication information. This allows the use of almost any authentication method, including secure access tokens or one-time password systems.
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