netgraph is thegraph basedkernelnetworking subsystem ofFreeBSD since 3.4 andDragonFly BSD since the fork from FreeBSD.[1] Netgraph provides support forL2TP,PPTP,ATM,Bluetooth using a modular set of nodes that are the graph.
Netgraph has also been ported on other Operating Systems:
Netgraph was originally designed and implemented atWhistle Communications by Julian Elischer and Archie Cobbs for the Whistle InterJet small office router product. The purpose of the project was to create a flexible framework for implementing new networking protocols. Key requirements included the ability to prototype with user-space programs while still retaining the ability to interact with data flows normally hidden within the kernel.
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