"Special purpose routing devices are ascendant in the IP world
today, with specialized hardware and operating systems. Yet Unix
has been in service routing IP for a long time, and Unix developers
continue to improve and expand Unix routing features. A combination
of factors now make Unix routers attractive for certain common
"One of these factors is the availability of free
implementations of the platonic ideal of Unix. I'm refering to
Linux and the FreeBSD/NetBSD/OpenBSD family..."
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