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Arpanet was the original name for the Internet. Initially, it was deployed on Unix systems by the U.S.Defense Advanced Research Project Agency. Nowadays, it has become the water of life for Linux. The WWW has played a significant role in making it popular from the time it eclipsed some infamous contemporaries like Gopher, Usenet, WAIS and Hytelnet.
Linux supports all Internet related protocols. It adopted Telnet and FTP from the beginning. It still includes UUCP and Lynx.The PPP protocol is widely used for dial-up networking. It is included in every installation. Both KDE and GNOME have embedded a graphical based PPP connection software among their applications. A command line equivalent is pppsetup.
A modem is configured first with interpreting the port it is using. Most modems have their jumper setting defaulted to specific ports. It could be COM3 or COM4. It depends which port is being used to be interpreted by Linux. Under Linux, COM is translated as ttyS0, ttyS1, etc, depending on the number of ports being used. Secondly, find about the speed of transmission(e.g. 24000 baud rate). And last, enter the information pertinent to the ISP. Then configure the dial-up utility.
Internet security is a global concern for the corporate. There is an ongoing abuse of resources. Linux has been used on many occasions as an vehicle for unorthodox means. But it is also a medium to prevent major corporate disasters. The ipchains program now called IPSec on kernel 2.4 and up is a firewall which covers a number of security holes in systems. It should be installed each time a network is connected to the Internet. Even tough Linux is immune to virus attacks, it would be necessary to consider that windows workstations are not. There are anti virus programs that run under the Linux shell and protect the windows network.
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