| What does it do?
Mac OS components to support Internet connections provide a number of layers, starting from basic TCP/IP and dial-up PPP protocols, and reaching up to Web browsers such as Microsoft Internet Explorer and Netscape Navigator/Communicator. When correctly configured, they make it simple to connect to the Internet, via dial-up phone lines or a permanent connection. Originally, MacTCP and ConfigPPP were the basis, but when Open Transport comms support was introduced with System 7, this evolved into the current combination of Remote Access and TCP/IP. How does it work?
At the lowest level, Open Transport controls the hardware, including both internal and external modems, and network interfaces. The key Internet protocols, Transmission Control Protocol and the Internet Protocol (TCP/IP), are responsible for performing the transfer of data in small packets. Over a dial-up line, the Point to Point Protocol (PPP) handles negotiation and operation of the connection. Internet applications such as Web browsers, emailers, and newsreaders then use their own protocols (HTTP for the Web, FTP for file transfers, POP and SMTP for email, and so on) on top of those. What can go wrong with it?
Almost anything, given the multiple layers and large number of different settings which have to be made correctly. Failure to connect can result from missing or erroneous settings in the TCP/IP control panel, or Remote Access (or FreePPP if you prefer). Many services require a logon script, in which the user name and password are given, and this is a source of many failures. All good ISPs should be able to talk you through the correct configuration of your TCP/IP, Remote Access, and other control panels, and have information on setting up email and other software. How can I upgrade it?
Low-level components are part of the Mac OS, but periodic updates and fixes are provided by Apple. Third-party tools, such as FreePPP, are available from their own Web sites, while high-level applications like browsers are maintained by their developers, with their updates available for downloading or on CD-ROM. Further info
Many books detail the use of the Internet, but only dedicated Mac texts are good enough to use as a reference. Web sites worth visiting include: Mac On the Net (www.moxienet.com/macnet); and BrowserWatch (browserwatch.internet.com), which has the latest news and plug-ins for Web browsers. | |
