devices

Nokia Open Source Web browser for S60 Smartphones

Nokia unveiled the new Web browser for its world leading smartphone software, S60 platform aimed to provide smartphone users with a true Web experience when browsing full Web pages on the Internet using a smartphone. “The new Web browser for S60 is based on the WebCore and JavaScriptCore components of Apple’s Safari Web Kit, the industry’s smallest [...]

How to configure single IP Addresses in IPtables

Opening up a whole interface to incoming packets may not be restrictive enough and you may want more control as to what to allow and what to reject. Lets suppose we have a small network of computers that use the 192.168.0.x private subnet. We can open up our firewall to incoming packets from a single [...]

How to Verify Email Security With tcpdump

I can use tcpdump to verify that encryption is working. Here is what a plain unencrypted POP mail session looks like. This is an abbreviated example showing only the initial three-way TCP handshake. You can do this yourself by firing up tcpdump, then checking mail. Ctrl+C stops it: # tcpdump port 110 15:04:49.050227 windbag.34348 > [...]

How to Implement Disk Quotas on Linux

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 [...]

Using teaming adapters with network load balancing may cause network problems

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 [...]

How many way to share the files in windows

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 [...]

How to Back Up and Restore OpenVZ VMs With vzdump on CentOS

OpenVZ is an operating system-level virtualization technology based on the Linux kernel and operating system. OpenVZ allows a physical server to run multiple isolated operating system instances, known as containers, Virtual Private Servers (VPSs), or Virtual Environments (VEs). It’s similar to FreeBSD Jails and Solaris Zones. vzdump is a backup and restore utility for OpenVZ [...]

How to Build a diskette-based bandwidth management system – PicoBSD

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 [...]

An Introduction to Basic IPv4 Routing

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 [...]

How to Configure Cisco Devices To Use An NTP Server

You can use NTP to synchronize time on a variety of devices including networking equipment. I have included the necessary NTP commands for a variety of Cisco Systems products because it is one of the most popular manufacturers of networking equipment and would feature in the overall architectures of many home office/small office (SOHO) environments [...]