connection
This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem [...]
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7 Ways to Share Information in Windows Environment Got a document, graphic, spreadsheet, program, or just a thought you want to share with your co-workers? The method you choose to share it depends on the content you’re sharing, your personal work style, the tools you have, and if you’re at home, in your office, or [...]
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Command Summary Use arp Command mostly used for checking existing Ethernet connectivity and IP address Most common use: arp This command should be used in conjunction with the ifconfig and route commands. It is mostly useful for me to check a network card and get the IP address quick. Obviously there are many more parameters, [...]
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An alternative to TCP wrappers (although you can use both at the same time) is limiting SSH access with iptables. Here’s a simple example of how you can allow only a specific host to connect to your SSH service: ~# iptables -A INPUT -p tcp -m state –state NEW –source 193.180.177.13 –dport 22 -j ACCEPT [...]
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This approach is useful if you would like to allow only specific hosts on a network to be able to connect to your SSH service, but you don’t want to use or mess up your iptables configuration. Instead, you can use TCP wrappers; in this case the sshd TCP wrapper. I will make a rule [...]
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Many users, despite having a good Net connection, complain about poor surfing and download speeds. While an organization could pay for additional bandwidth, a better option might be to manage the bandwidth they already have. There are numerous bandwidth management software tools available. In this article we will explore managing network bandwidth using the dummynet [...]
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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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The Virtual Private Network – VPN – has attracted the attention of many organizations looking to both expand their networking capabilities and reduce their costs. The VPN can be found in workplaces and homes, where they allow employees to safely log into company networks. Telecommuters and those who travel often find a VPN a more [...]
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Installing Prerequisites If you are running on Ubuntu or another Debian distribution, you can install the required software by simply running the following command from a terminal prompt: sudo apt-get smbclient smbfs Testing the Connection Now that you have the right tools installed, it’s time to test the connection to the Windows or Samba box [...]
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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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Dovecot is a Mail Delivery Agent, written with security primarily in mind. It supports the major mailbox formats: mbox or Maildir. This section explain how to set it up as an imap or pop3 server.
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Subversion depends on a number of third party tools and libraries.Some of them are only required to run a Subversion server; others are necessary just for a Subversion client. This section explains what other tools and libraries will be required so that Subversion can be built with the set of features you want
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Virtual Private Networking, or VPN, is a technology that lets people access their office’s computer network over the Internet while at home or traveling. Accessing a network in this way is referred to as remote access. (For comparison, another common form of remote access is dialing in to the office network over a telephone line.) [...]
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Let say you are on an expensive satellite link that can barely provide enough bandwidth for your company’s Internet Access and you will want to do whatever you can to get as much as possible out of this link. Moreover, occassionally you loose power from the utility company, long enough for your UPS to run [...]
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Most Linux distributions ship with tcp_wrappers “wrapping” all your TCP services. A tcp_wrapper (known as /usr/sbin/tcpd) is invoked from/sbin/inetd instead of the real service, such as telnet or ftp. tcpd then checks the host that is requesting the service and either executes the real server or denies access from that host. tcpd allows you to restrict access to your tcp services. You should make [...]
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