group
Use the Active Directory Users and Computers snap-in to configure the DnsUpdateProxy security group. For more information, refer to Windows 2000 help, and search for “To add a member to a group”. Note If you are using multiple DHCP servers for fault tolerance and you use secure dynamic updates, add each of the computers that [...]
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Sometime it is necessary to block incoming connection or traffic from specific remote host. iptables is administration tool for IPv4 packet filtering and NAT under Linux kernel. Following tip will help you to block attacker or spammers IP address. Â The blocklist is create with an API I wrote and you can use wget to update [...]
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A simplistic approach would be to simply divide the disk space by the number of users and/or groups using it. For example, if the system has a 100GB disk drive and 20 users, each user will be given a hard limit of no more than 5GB
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When each quota-enabled file system is remounted, the system is now capable of working with disk quotas. However, the file system itself is not yet ready to support quotas. To do this, you must first run quotacheck. The quotacheck command examines quota-enabled file systems, building a table of the current disk usage for each one. This table is [...]
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This tutorial walks you through implementing disk quotas for both users and groups on Linux, using a virtual filesystem, which is a filesystem created from a disk file. Since quotas work on a per-filesystem basis, this is a way to implement quotas on a sub-section, or even multiple subsections of your drive, without reformatting. This [...]
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Successfully networking your Ubuntu system with Windows clients involves providing and integrating with services common to Windows environments. Such services assist the sharing of data and information about the computers and users involved in the network, and may be classified under three major categories of functionality: File and Printer Sharing Services. Using the Server Message [...]
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If a user is authenticated at the proxy you cannot “log out” and re-authenticate. The user usually has to close and re-open the browser windows to be able to re-login at the proxy. A simple configuration will probably look like this: Â acl my_auth proxy_auth REQUIRED http_access allow my_auth http_access deny all But there is [...]
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Some hardware manufacturers offer fault tolerance with their network adapters and accompanying drivers. Fault tolerance technology lets you group network adapter ports for a connection to a single physical segment. If connectivity through one port does not work, another port is opened automatically. This operation is transparent to the operating system and other devices on [...]
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This article describes new options that you can use to assign user rights in Windows that affect the Terminal Services feature. Windows Server 2003 includes the following new User Rights options: Allow logon through Terminal Services Deny logon through Terminal Services You can use these options to change the set of permissions a user must [...]
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SafeSquid has an option in ‘Network Settings’, to add new interface for outgoing connection.This is useful in networks where you need to split the load between different ISPs. It can also be useful to switch different ISPs due to slow net connection or discontinuity.This can be accomplished by following way: You wish to – 1. [...]
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ImageMagick® is a software suite to create, edit, and compose bitmap images. It can read, convert and write images in a variety of formats (over 100) including DPX, EXR, GIF, JPEG, JPEG-2000, PDF, PhotoCD, PNG, Postscript, SVG, and TIFF. Use ImageMagick to translate, flip, mirror, rotate, scale, shear and transform images, adjust image colors, apply [...]
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It includes an attractive web interface for users, admins, and clients to access and update their DNS zone data as well as a rich API for provisioning systems to interact with. All zone data is stored in MySQL and is extracted by export scripts to the DNS server of choice (tinydns, BIND, PowerDNS). Updates are [...]
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All of the operations considered in this article are operations upon a router, whether that router is a Linux box or Cisco dedicated hardware or some other type of machine. In this chapter I consider the traditional methods of IPv4 routing as using static configurations that are manually input by the network administrator. 1.1 Traditional [...]
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Grep is by far the most popular command that exists in Unix. Though some may argue about that, but once you begin using grep, it would always be present in all your complex commands that you think of executing at the shell prompt. grep stands for ‘global regular expression printer‘ . Which makes no sense [...]
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This is an introductory guide for people learning to use a Linux system. It focuses on command-line usage. This is not because everyone will be doing everything at the command line. On the contrary, there are many useful GUI tools and programs in Linux, and some people will be content to stay with these. However, in contrast to GUI programs, which can be learned largely by “click and try”, the command-line requires some deliberate learning, and reading documentation. The benefit of this investment is that you will learn the tools and tricks of the command line which are in many cases faster, more powerful, and more flexible than any GUI program.
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