Policy Routing Using Linux by Matthew Marsh

By Matthew Marsh

Conventional IPv4 routing is summarized as "All routing is a vacation spot pushed process". whilst a router appears to be like at an IPv4 packet it cares merely concerning the vacation spot tackle within the header of the packet. It makes use of this vacation spot deal with to decide on the place to ahead the packet. yet what a good way to direction packets otherwise based not just at the vacation spot addresses but in addition on different packet fields akin to resource handle, IP protocol, delivery protocol ports or maybe packet payload? this is often coverage Routing and this publication tells you the way to do it.

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Policy Routing Using Linux

Conventional IPv4 routing is summarized as "All routing is a vacation spot pushed process". while a router seems at an IPv4 packet it cares simply in regards to the vacation spot tackle within the header of the packet. It makes use of this vacation spot tackle to choose on the place to ahead the packet. yet what so that it will course packets in a different way based not just at the vacation spot addresses but in addition on different packet fields reminiscent of resource deal with, IP protocol, shipping protocol ports or perhaps packet payload?

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The concept as proposed with the release of IPFWADM and extended by IPChains is that there are three primary locations in the packet path: the INPUT, OUTPUT, and FORWARD chains. These are the locations at which you would want to intercept the packet. A transverse packet that crosses through the system crosses all three chains, whereas a packet that originates from within the system only crosses two. 1. 1. 2. You can see the three main chains: INPUT, OUTPUT, and FORWARD. Think again of the differentiation of the packet paths.

Within each section as the commands are illustrated the usable abbreviations are shown. However, I strongly recommend that when you use the ip command within scripts, you make it a habit to always use the full command-line specification. Using the abbreviations is easy on the command line but harder to easily read and understand within scripts. Since you may not be the only person who ever has to deal with your scripts, you should strive to make them as complete as possible. Command Command specifies the action to perform on the object.

Parameters These consist of a keyword followed by a value. Each command has a default parameter that is used if the arguments are omitted. For example, the dev parameter is the default for the ip link command; thus ip link list eth0 is equivalent to ip link list dev eth0. Within all the following command descriptions, I distinguish default parameters with the marker (default) next to the default command. As previously mentioned for the names of objects, all keywords may be abbreviated with the first or first few unique letters.

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