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> If you have one specialized need (i.e. one specific path for packets to travel), then it is just as valid an approach to trash every other path.

You only have one specialized need at the very beginning. Then you start seeing the need for "just another little feature". And soon you will start replicating big parts of the network stack. Call it Greenspun's tenth rule for the network, if you want.

Also, most of the time, what you "just need" happens to be also the common need of many other users out there. Joining forces to fix a single code path is a much better investment than redoing things in userland for the sake of it.

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