Date: Tue, 30 May 2006 09:49:01 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: Brooks Davis <brooks@one-eyed-alien.net> Cc: freebsd-current@freebsd.org, Goran Gajic <ggajic@afrodita.rcub.bg.ac.yu> Subject: Re: question regarding tap/tun devices Message-ID: <20060530094715.L79162@fledge.watson.org> In-Reply-To: <20060530013856.GA26022@odin.ac.hmc.edu> References: <Pine.LNX.4.63.0605282032240.10175@afrodita.rcub.bg.ac.yu> <20060530013856.GA26022@odin.ac.hmc.edu>
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On Mon, 29 May 2006, Brooks Davis wrote: > On Sun, May 28, 2006 at 08:33:32PM +0200, Goran Gajic wrote: >> I'm running 7.0-CURRENT build Thu May 25 23:17:10 CEST 2006 GENERIC config. >> While playing with dynamips emulator which uses tap I've noticed that >> ifconifg tun0 create or ifconfig tap0 create doesn't work (this doesn't >> have anything to do with emulator which works great). > > These interfaces don't use the network interface cloning interface and thus > can not be created with ifconfig. This should be fixed, but the /dev based > cloning hackes they use make this difficult. I've never quite understood if this is a problem or a benefit. Devfs-cloning of tap and tun are very convenient from an application writer perspective -- you just open /dev/tap or /dev/tun, and magic happens. With our current ifnet cloning interface, is it possible to say "atomically create and return the next available interface number"? Robert N M Watson
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