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Download File - Ram Chavan
Transcript
tftp 69/udp # specific services login 513/tcp who 513/udp whod Most /etc/services files will have many more lines, because a wide number of TCP/IP services are supported by most versions of Linux. Most Linux systems are not used as firewalls to the Internet or between LANs, so administrators of most Linux machines will never have to worry about the contents of this file. On the other hand, if your machine is going to act as a firewall or you are very worried about security, you may want to manually modify the /etc/services file. The Loopback Driver The loopback driver is one of the most fundamental and oft-used diagnostic tools available to a system administrator. The loopback driver acts like a virtual circuit out of and back into the host machine. All outgoing information is immediately rerouted back to an input. You can use the loopback driver to test your machine's circuits by eliminating any external influences (including the network card, the network itself, gateways, or remote machines). With the loopback driver, you can ensure that the local machine is
