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From: Jonathan Mini <mini@freebsd.org>
Date: Mon, 1 Dec 2003 22:08:15 -0800
To: Robert Watson <rwatson@freebsd.org>
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Subject: Re: ifconfig(8) refactoring -- YACC grammar now online
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On Nov 30, 2003, at 2:41 PM, Robert Watson wrote:

> if_tap is actually quite useful, and in the same general class of
> synthetic interfaces as if_tun.  I've used both in building tunneling 
> and
> topology-manipulation tools, as well as for debugging routing, etc.
> if_tap simulates an 802 device, and if_tun simulates a point-to-point
> device.  VMware is the only application I know of using if_tap, 
> although I
> have a fair amount of my own code that uses it.  Userland ppp uses 
> if_tun,
> as to some of the third party crypto tunneling tools.

F5 uses if_tap for management traffic, as our internal framework looks 
a lot
more like an 802 environment than a point-to-point link.

Both if_tap and if_tun are quite handy, given different types of 
projects.

-- 
Jonathan Mini
mini@freebsd.org
http://www.freebsd.org