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One common sendmail configuration is to have a single machine act as a mail gateway for all the machines on your network. com that does all our mail. cw. cw - include all aliases for your machine # here. com. com. Please be aware that if you configure your system to masquerade as another any e-mail sent from your system to your system will be sent to the machine you are masquerading as. com. 10 Controlling Access to Services As a security measure, most network services are managed by a protective program called a TCP wrapper.

D/sound to set up your system properly. The sole use of this is to determine what card entry in the menu to pop up by default the next time sndconfig is run. It may contain the following: • CARDTYPE=, where is seen as, for example, CARDTYPE=SB16. Files in /etc/sysconfig/network-scripts/ The following files are normally found in /etc/sysconfig/network-scripts: • /etc/sysconfig/network-scripts/ifup • /etc/sysconfig/network-scripts/ifdown 61 62 Chapter 2:System Administration • /etc/sysconfig/network-scripts/network-functions • /etc/sysconfig/network-scripts/ifcfg- • /etc/sysconfig/network-scripts/ifcfg-- /etc/sysconfig/network-scripts/chat- /etc/sysconfig/network-scripts/dip- /etc/sysconfig/network-scripts/ifup-post /etc/sysconfig/network-scripts/ifdhcpc-done • • • • Let’s take a look at each one.

Then the kernel takes over. The kernel looks in several different places for init (/sbin is a common location) and runs the first one it finds. Init takes over. starts (and becomes the parent or grandparent of) all of the processes which make up your Linux system. sysinit, which sets your path, sets up networking if necessary, starts swapping, checks the filesystems, and so on. sysinit is taking care of everything that your system needs to have done at system initialization. sysinit uses the information in the /etc/sysconfig/network and /etc/sysconfig/clock files to initialize network processes and the clock.

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