Own VPN, Without the Expensive Softwares

Set Up Your Own VPN, Without the Expensive Software By David If you want secure access to your network when away from the office, you can setup a Virtual Private Network (VPN ). You can connect via the Internet and securely access your shared files and resources. You don't have to buy an expensive VPN server if don't have a lot of users. Windows actually provides VPN server and client functionality. In this tutorial, we'll set up the Windows 7 or Vista VPN server and connect with Windows XP, Vista, or 7. Now let's get started! Avoiding IP conflicts Since VPN connections link networks together, you must be careful with the subnet and IP addressing so there aren't any conflicts. On the network hosting the VPN server, you should use an uncommon default IP for the…
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Configuring Postfix as backup MX host

Overview The backup MX host must accept and queue mails, if the primary mailhost is down for a certain domain. To have a high degree of availability the backup MX host must be located outside the backed up domain. You can setup the backup MX host as a primary or secondary mx for a remote site. The primary mailhost is down ...     Email is delivered to the backup MX host and queued there .... After the primary mailhost is up and running again, email is delivered from the backup MX host to the primary mailhost and stored in the local mailboxes. Setup of a primary mx host for a remote site DNS entry on the remote site:      IN MX 10 mail1.backup1.com. IN MX 20 mail2.backup2.com. All email for the remote site is delivered to the…
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Google to fall in love with you – haha

The more often your site gets crawled, the sooner your new content can start appearing in the search results, and bringing in traffic and sales. So here's how, in just nine steps, you can keep Google coming back for more. The more often your site gets crawled, the more quickly your content will appear in the search results. And that’s the point, right? You wouldn’t create a new product then keep it in the shed, would you? But the things you need to do to get your site crawled more frequently are also best practice SEO and could even improve your position in the search engines - getting even more of that money-making traffic. All this you can do in just nine steps. Create more content Creating new content is good for a whole range of…
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OSI

OSI (Open Systems Interconnection) has been developed by International Organization for Standardization (ISO). It is a networking flow of data built upon and comprehended as a virtual hierarchy. OSI Layer Model is the system’s conceptual model; it is abstract and not physical as the motherboard or RAM, but the working of the computer system is based on the layering of the OSI model. OSI model relates the computers’ functions together, characterizing the functions, as well as interconnecting and assembling the tasks to be performed. It is layered, therefore one look at the ‘layers’ of the OSI model will give you an idea about the order of fulfillment of computer tasks. The model has seven layers enumerated as follows: 7.         Application layer 6.         Presentation layer 5          Session layer 4.         Transport layer 3.         Network layer 2.         Data…
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