Category Archives: Networking & System Administration

Ubuntu 9.10 Packaging Guide

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Descriptors, Applications and Internet in the example, are separated by / and become increasingly specific moving from left to right. GuardDog is a firewall configuration utility for KDE. Start / Stop all of the instances and its enabled services. For this reason, /var/log/ftp.log must be readable by the root user only (which is the default). The second line specifies that any host with an IP address in the range 192.168.0.1 to 192.168.0.255 is permitted to access the NIS server.

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Ubuntu 10.10 Desktop Handbook

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You need this support only if you have one of the drives listed in the dialog box. LILO to boot from the options listed below this line. You should now find a Network Neighborhood icon on the desktop. 1. The irony here is that Windows rose to dominance, way back when, in large part by undercutting the competition (Macs) on cost. You should specifically tell the system the location of your modem, which would be /dev/ttyS0 to /dev/ttyS3.

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Oracle Linux System Administration Exam 1Z0-403

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Page Breaks: Page breaks for printing can be inserted in the file with the formfeed control character ^L; which can be inserted from insert mode by typing ^V ^L. To determine all current semaphore limits, use the following: You can also use the following command: The following list describes the kernel parameters that can be used to change the semaphore configuration for the server: semmsl - This kernel parameter is used to control the maximum number of semaphores per semaphore set.

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Linux Kernel Programming (3rd Edition)

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The netstat command can also print out the information about the network interfaces. GNU/Linux operating systems have a steeper learning curve for the average user. Van Vugt: It's true, Linux is a free operating system. Since Windows is the most widely used OS, hackers, spammers target Windows frequently. If the challenge and reply are the same, the client is authenticated. If the client system can resolve host names to IP addresses without NIS (if, for example, the client runs a caching name server or has an entry in /etc/hosts for the NIS server) you can use a host name instead of an IP address, but your best bet is to use IP addresses in /etc/yp.conf to minimize problems that might arise if name lookup services become inoperable for some reason.

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UNIX Operating System Success in a Day: Beginners Guide to

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NIS domains are typically used as system management tools, a convenient method for organizing groups of machines that need to access the information shared across a network using a set of common NIS maps. The standards and technology that have just been discussed help define the specific products that network managers use to build Ethernet networks. The router uses powerful detachable Wi-Fi antennas to further extend wireless range.

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Ubuntu 16.04 LTS Server: Administration and Reference

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N (#1) identifies the rule number that generated the log entry. N Access to machines in the DMZ from hosts on the internal, protected side of the firewall must be severely curtailed. In this chapter, we look at those requirements. Wildcards and special characters Wildcards are single characters that stand for or substitute for one or more values. GUI tools deliberately hide complex, often unintuitive configuration files and commands behind an attractive, convenient interface.

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Linux DNS Server Administration (Craig Hunt Linux library)

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Checking _PATH_FTPHOSTS :: /etc/ftphosts ok. As the output shows, ckconfig complained that it could not find /etc/ ftpusers and /etc/ftpservers. The ssh server listens on port 22. sshd can be configured to run on an alternate port. -g] filesys timeb timei 483 The manual page for setquota mistakenly uses -p instead of -t for the third form. Edit /etc/fstab to enable quotas on the desired file systems. 2. Next you need to let Messenger know which of your ISP’s servers deliver your e-mail.

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Linux Network Administrator's Guide (2nd Edition)

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At the core of the OS, many improvements have been made to the memory manager, process scheduler and I/O scheduler. The first component, /usr/bin/passwd [A-z]*, indicates that /usr/bin/passwd may be used with any argument that begins with the letters A–Z or a–z followed by zero or more characters. Add a host's IP address: /sbin/arp -s hostname XX:XX:XX:XX:XX:XX pub Delete a host from the table: /sbin/arp -d hostname This can be used to remove a duplicate IP or force a new interface to provide info.

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Beginning Ubuntu LTS Server Administration: From Novice to

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Other examples are Microsoft Certified System Administrator or MCSA for those managing Microsoft server technologies or Red Hat RHCT for those using Linux technologies. More information is available from the LAME website.. You then configured a primary master name server, looked at some of the diagnostic utilities available for the BIND package, and used them to test your name server. For example: For --hide KDE Workstation you need to use only the KDE Workstation part for that specific package to be installed.

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Puppet Reporting and Monitoring

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Ports may be viewed as attachment points for network connections. Offending key for IP in /home/suso/.ssh/known_hosts:10 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Because you are installing Red Hat Linux from scratch, however, you have to perform this crucial step yourself.

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