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Point-to-Point Tunneling Protocol (PPTP)

server s address to the e-mail client (Figure 9-28) Every e-mail client has a different way to add the server IP addresses, so you may have to poke around, but you ll find the option there somewhere! In many cases this may be the same IP address for both the incoming and outgoing servers the folks administering the mail servers will tell you Besides the e-mail server addresses, you must also enter the user name and password of the e-mail account the client will be managing

n =1

Point-to-Point Tunneling Protocol (PPTP) enables the secure transfer of data from a remote client to a private enterprise server PPTP supports multiple network protocols, including IP, IPX, and NetBEUI You can use PPTP to provide a secure virtual network using dial-up lines, over LANs, over WANs, or across the Internet and other TCP/IP- based networks In order to establish a PPTP VPN, you must have a PPTP server and a PPTP client Windows 2000 Client and Server software includes the necessary parameters to configure PPTP communication

File Transfer Protocol (FTP) is the original protocol used on the Internet for transferring files Although HTTP can be used to transfer files as well, the transfer is often not as reliable or as fast as with FTP In addition, FTP can do the transfer with security and data integrity FTP uses TCP ports 21 and 20 by default FTP sites are either anonymous sites, meaning that anyone can log on, or secured sites, meaning that you must have a user name and password to be able to access the site and transfer files A single FTP site can offer both anonymous access and protected access, but you ll see different resources depending on which way you log in

The following is a list of key points that need to be recognized and understood before you implement PPTP PPTP uses Microsoft's implementation of RAS and the Point-to-Point Protocol (PPP) to establish connections with remote computers by using dial-up lines The mechanics of PPP are discussed in upcoming sections To use PPTP, you must install and configure RAS with Dial-Up Networking on the PPTP server as well as the clients For a dial-up solution, you must establish a PPP account with your ISP PPTP uses VPNs that are installed and configured in RAS as if they were physical devices PPTP is only installed on the client and on the server not on any devices in between Consider placing the PPTP server on the external side of a firewall The firewall can then check the traffic before allowing it onto the internal network PPTP clients must be authenticated

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OC-1 OC-3 OC-12 OC-24 OC-48 OC-192 OC-256 OC-768

STS-1 STS-3 STS-12 STS-24 STS-48 STS-192 STS-256 STS-768

The IP address of the PPTP server must be a registered IP address when the tunnel goes through a public network All other addresses encapsulated within the data packets are irrelevant to the PPTP connection In order for PPTP to be installed and supported, you'll need to verify that your network supports the appropriate hardware; your network must also meet the minimum server and client requirements These stipulations are explained in the following sections

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All of these impressive connections that start with Ts and Os are powerful, but they are not in and of themselves a complete WAN solution These WAN connections with their unique packets (DS0, STS, and so on) make up the entire mesh of long-range connections we call the Internet, carrying both packetized voice data and TCP/IP packets All of these connections are point-to-point, so we need to add another level of devices to enable us to connect multiple T1s, T3s, or OC connections together to make that mesh That s where packet switching comes into play Packets, as you know from what you ve learned about networking, need some form of addressing scheme to get from one location to another The telephone industry came up with its own types of packets that run on T-carrier and OC lines to get data from one central office to another These packet-switching protocols are functionally identical to routable network protocols like TCP/IP Today s WAN connections predominantly use two different forms of packet switching: Frame Relay and ATM