Network Packet Capturing For Linux
Category : Computers » Linux Networing
Most network applications -- from Virtual Private Networks (VPNs) to routers to . an important pillar of Linux networking and is architected. beautifully. .
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Content Summary :
Information these days spends much of its time encapsulated in packets, flowingthrough pipes known as networks. In this tutorial, we will be capturing those packetsas they flow, and the platform on which we will be capturing them is Linux. Most network applications -- from Virtual Private Networks (VPNs) to routers tosniffers -- have some sort of packet capturing mechanism. So anyone involved withwriting such software can benefit from this tutorial. Because several of the packet filtering mechanisms we will examine are kernelmodules, we will also briefly cover those, as well as kernel compilation. We will also review some of the mechanisms that were unsuccessful for me: I couldget only a copy of the packet instead of intercepting the original. This discussion cannot only save you the trouble of duplicating my efforts, but can also be useful fornetwork applications like sniffers. Apart from a general familiarity with the different packet capturing mechanismsincluding firewall hooks, divert socket, and netfilter; readers will also gain knowledgeabout Linux networking and the TCP/IP stack. There is even some source code toget you started.
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