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GNU Zebra is one of the oldest open-source Dynamic Routing Protocol suite stack developed by Kunihiro Ishiguro. Zebra supports features such as RIPv1/RIPv2 for IPv4 and RIPng for IPv6, OSPFv2 and OSPFv3, BGPv4+ and so on. Zebra is an active project for many years. After many years of active support Zebra is discontinued, and sometime down the lane a new fork is created from Zebra called Quagga which is now maintained by a separate independent open-source community. Quagga is a routing software suite, providing implementations of OSPFv2, OSPFv3, RIP v1 and v2, RIPng and BGP-4 for Unix platforms, particularly FreeBSD, Linux, Solaris and NetBSD. Quagga is a fork of GNU Zebra which was developed by Kunihiro Ishiguro. The Quagga architecture consists of a core daemon, zebra, which acts as an abstraction layer to the underlying Unix kernel and presents the Zserv API over a Unix or TCP stream to Quagga clients.

Here is a quick reference of important Linux Kernel Data Structures of various assorted Kernel Subsystems such as: Process, Memory Management, Networking, File System, Device Drives, IPC and so on. So when you write custom Kernel code, it is often you may need to populate a new instance of one of these data-structures or just access the existing ones. Hence it is very important to know some of these and get familiarized with. You can bookmark this page, so that you can use this as a quick reference when you write your own custom Linux Kernel Modules.

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