Click Intro

Click can be found @ http://www.read.cs.ucla.edu/click/
Click paper @ https://pdos.csail.mit.edu/papers/click:tocs00/paper.pdf

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sudo apt-get update
sudo apt-get install git build-essential

git clone https://github.com/kohler/click.git
cd clikc  
./configure
# More info on building options can be found @ INSTALL
sudo make install
# Test click setup
click conf/test.click

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/* A click that binds to eth0 and prints every ip packet sent to 10.0.1.166. */

c ::  Classifier(12/0800, /* IP protocol */
  - /* everything else */);

FromDevice(eth0) -> c -> CheckIPHeader(14, CHECKSUM false) -> IPClassifier(ip dst 10.0.1.166) -> Print(ok) -> Discard;

/* Non IP packets are discarded.
c[1] -> Discard;