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Routing and Remote Access Service (RRAS)

(Skill 5). Introducing Routing and Remote Access Service (RRAS). Routing and Remote Access Service (RRAS)

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Routing and Remote Access Service (RRAS)

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  1. (Skill 5) Introducing Routing and Remote Access Service (RRAS) Routing and Remote Access Service (RRAS) • Can be configured on a Windows Server 2003 computer to create a remote access service (RAS) server that can manage hundreds of concurrent dial-up connections or to receive Virtual Private Network (VPN) connections on the internal network • Can also be configured to provide shared Internet access using Network Address Translation (NAT) or to create a secure connection between two servers on the Internet connecting two LANs

  2. (Skill 5) Introducing Routing and Remote Access Service (RRAS) (2) • Remote access service (RAS) server • A computer running Windows Server 2003 and RRAS • Configured specifically to function using a modem or modem pool • Users can dial in from a remote computer that is also configured with a modem • A Virtual Private Network (VPN) server is a type of remote access server

  3. (Skill 5) Introducing Routing and Remote Access Service (RRAS) (4) • To establish a dial-up connection, Windows Server 2003 uses either PPP or SLIP WAN protocols • Point-to-Point Protocol (PPP) • Allows remote clients to access network resources • Provides error-checking to detect possible problems prior to data transfer • Serial Line Internet Protocol (SLIP) • An older remote communications protocol used by UNIX computers • Does not provide security • Transfers data without checking for errors

  4. (Skill 5) Introducing Routing and Remote Access Service (RRAS) (5) PPP supports many networking and authentication protocols • Password Authentication Protocol (PAP) • The least secure authentication protocol • Uses plain text passwords for authentication • Shiva Password Authentication Protocol (SPAP) • An authentication protocol used to connect to a Shiva server • More secure than PAP; less secure than CHAP or MS-CHAP • Challenge Handshake Authentication Protocol (CHAP) • Sends a challenge message to the client, the client applies an algorithm to the message to calculate a hash value (a fixed-length number), and sends the value to the server • The server also calculates a value and compares it to the client’s • If the values match, a connection is established

  5. (Skill 5) Introducing Routing and Remote Access Service (RRAS) (6) • MS-CHAP • Microsoft’s version of CHAP • The challenge message is specifically designed for Windows operating systems and one-way encryption is used • MS-CHAP2 • Authenticates both the client and the server • A different encryption key is used to transmit and receive data • Extensible Authentication Protocol (EAP) • Used to customize your method of remote access authentication for PPP connections • Supports multiple authentication methods • IEEE 802.1X • New in Windows Server 2003 is support for IEEE 802.1X • Allows wireless and Ethernet LAN connections

  6. (Skill 5) Figure 11-38 RAS

  7. (Skill 5) Figure 11-39 Dial-up connections

  8. (Skill 5) Figure 11-40 SLIP and PPP

  9. (Skill 5) Figure 11-41 Tunneling

  10. (Skill 6) Understanding Types of Remote Access Connections • Types of dial-up equipment used to establish a connection between a remote network and a remote access client • POTS (Plain Old Telephone System) • ISDN (Integrated Services Digital Network) • DSL (Digital Subscriber Line) • Cable modem lines • Frame relay • Leased telecommunication lines • Modems (asynchronous and synchronous)

  11. (Skill 7) Figure 11-49 The Routing and Remote Access console

  12. (Skill 7) Click to open the Authentication Methods dialog box to set the authentication protocols Figure 11-52 The Security tab

  13. (Skill 8) Creating a Remote Access Policy (3) Remote access profile settings • Allowed dial-in days and times • Connection limits • Allowed dial-in media and phone numbers • Authentication settings • Encryption settings

  14. (Skill 8) Only available in Windows 2000 native mode or Windows 2003 mode domains. When this option is set, the permissions configured in the remote access policy are checked. If they are set to Grant, the profile is applied. If they are set to Deny, the caller is disconnected. Figure 11-54 The Dial-in tab in the Properties dialog box for a user

  15. (Skill 8) Click to open the Add IP Filter dialog box Figure 11-56 The Inbound Filters dialog box

  16. (Skill 8) Allows clients to connect using 40-bit encryption key MPPE or IPSec encryption Allows clients to connect using 56-bit encryption key MPPE or IPSec encryption Allows clients to connect using 128-bit encryption key MPPE or IPSec encryption Allows clients to connect without using data encryption Figure 11-66 The Encryption tab

  17. (Skill 9) Figure 11-68 Creating a VPN

  18. (Skill 9) Figure 11-69 Creating a VPN server

  19. (Skill 11) Introducing Network Address Translation (NAT) • Network Address Translation (NAT) also allows computers on a network to share a single Internet connection, but with greater flexibility • The NAT service translates private IP addresses to public IP addresses and vice versa as they are forwarded from client computers to a server or from the server to client computers • Using NAT, you can determine your own IP address range, making NAT extendable for a larger network that has multiple subnets over a routed network • NAT includes a basic firewall to help protect clients from intrusions from the Internet • You can also configure static packet filters to designate the kinds of traffic you will allow to both enter and leave the internal network

  20. (Skill 11) Figure 11-81 NAT

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