a186cbef4e
tells that tun unit to prepend a four byte address family to packets queued for tunread() and to expect a four byte address family at the front of data received by tunwrite(). We queue any protocol received from the interface for tunread(), but only accept INET, INET6, IPX and NETATALK from tunwrite(). There is support for Xerox's NS stuff, but AFAICT config(8) doesn't ever define NS.
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