Unit07
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1) Remote nodes connect to networks via dial-up, DSL, cable or VPN and allow remote access but are slower than local connections. 2) Remote control allows users to access applications on a local network node from a remote computer by transmitting keyboard/mouse inputs rather than processing data remotely. 3) Configuring remote connections involves clients establishing tunnels via PPTP or L2TP to a remote access server providing VPN services to securely access the local network over the Internet.
Unit07
- 1. Unit07: Networking with Remote Clients and Servers
- 2. Overview • Remote Node • Remote Control • Configuring a Connection
- 3. Remote Node • Remote nodes were computers that connected to a network via a dialup line • Nodes connect via ISDN, DSL, cable modem, and Virtual Private Networking (VPN) across the Internet • Remote node computing is notoriously slow, primarily because dialup • the remote node is not much different from a local node on the network
- 4. Remote Node
- 5. Remote Node
- 6. Advantages of Remote Node Computing • ease of configuration • it can be run across any dialup line, cable, DSL and so on • wide variety of operating systems natively support remote access • there are no graphics restrictions
- 7. Disadvantages of Remote Node Computing • Issue of slow speed • Driven by the need to use certain applications • Problem for network administrators arises —licensing • Support issues can be horrendous
- 8. Point-to-Point Connection with PPP • PPP is based on an earlier protocol • Serial Line Internet Protocol (SLIP ) • SLIP worked only on TCP/IP networks
- 9. Using DSL for Remote Node • Digital Subscriber Line (DSL) is growing as a dialup technology for remote node • DSL uses the same lines as regular telephone calls – ADSL – G.Lite – HDSL – VDSL
- 10. Remote Access Service (RAS) • When you dial into a network as a remote node, you log into a remote access server • A variety of remote access servers is available • RAS server placement is key to performance
- 11. RAS
- 12. Tunneling to a Virtual Private Network • Virtual Private Networking (VPN) describes remote nodes that access a network via the Internet in a secure fashion • Many encryption schemes can encode data with strengths up to 128 bits • VPN is available to clients who connect to the Internet through nearly any type of link • VPN creates a virtual point-to-point connection to the RAS • Tunneling is driven by the need to protect that virtual point-to-point link from being interrupted or eavesdropped upon
- 13. VPN
- 14. Tunneling Protocol • Point-to-Point Tunneling Protocol – Point-to-Point Tunneling Protocol (PPTP) takes its name from PPP because it uses PPP – PPTP encapsulates PPP frames within IP datagram • Layer 2 Tunneling Protocol – The Layer 2 Tunneling Protocol (L2TP) was developed to establish a viable alternative to PPTP – Like PPTP, L2TP is an extension of PPP that supports multiple protocols – L2TP clients follow a similar process to PPTP
- 15. Remote Control • On the remote computer, a window would appear with the remote computer’s desktop within it • All application processing and data remained on the LAN • the only data that traveled to the LAN from the remote computer were keyboard and mouse clicks • Remote control computing overcame some of the issues with remote node computing • the remote computer didn’t need to be compatible with the network applications • little data had to traverse the connection between the remote computer and the local node • no issues with licensing because the application ran on the local node
- 16. Remote Control
- 18. Independent Computing Architecture from Citrix • Citrix developed its ICA protocol to facilitate remote control sessions • The protocol runs within the upper layers of the OSI reference model, including the application, presentation, and session layers • During the session, ICA carries keystrokes, mouse clicks, and graphical data in the form of compressed draw commands • ICA is supported by the latest Web browsers • ICA client can dial directly into a Citrix MetaFrame server and run a pure ICA session across the direct connection
- 19. Microsoft Remote Desktop Protocol • Remote Desktop Protocol (RDP) offers much the same type of service as ICA • original protocol used by Windows NT 4.0 Terminal Services Edition • RDP clients will operate only across a TCP/IP network • RDP is also the protocol used in Windows XP’s two native remote applications – Remote Desktop Connection application, which provides a single remote control session to a Windows XP computer. – Remote Assistance application
- 20. Configuring a Connection • A typical VPN deployment begins with a remote client that needs to access the local network that is already connected to the Internet • the client must make a second call across the Internet over the existing PPP connection • The call connects to a RAS providing PPTP or L2TP services and creates a tunnel
- 21. Server-Side Configuration • Ras • Windows 2000 Servers Are Equipped With Routing And Remote Access Service (Rras ) • Windows 2000 Rras Is Able To Authenticate Directly To The Active Directory Service • Distribute Dialup Rras Servers Throughout The Network To Reduce Dialup Telephone Costs
- 22. VPN