From owner-freebsd-hackers Tue Nov 14 09:39:05 1995 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.6.12/8.6.6) id JAA25580 for hackers-outgoing; Tue, 14 Nov 1995 09:39:05 -0800 Received: from who.cdrom.com (who.cdrom.com [192.216.222.3]) by freefall.freebsd.org (8.6.12/8.6.6) with ESMTP id JAA25554 for ; Tue, 14 Nov 1995 09:38:56 -0800 Received: from jhome.DIALix.COM (root@jhome.DIALix.COM [192.203.228.69]) by who.cdrom.com (8.6.12/8.6.11) with ESMTP id JAA08314 for ; Tue, 14 Nov 1995 09:38:40 -0800 Received: (from peter@localhost) by jhome.DIALix.COM (8.6.12/8.6.9) id BAA00724; Wed, 15 Nov 1995 01:30:46 +0800 Date: Wed, 15 Nov 1995 01:30:45 +0800 (WST) From: Peter Wemm To: Joe Greco cc: hackers@freebsd.org Subject: Re: if_mux hack? In-Reply-To: <199511141625.KAA28744@brasil.moneng.mei.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-hackers@freebsd.org Precedence: bulk On Tue, 14 Nov 1995, Joe Greco wrote: > > Sound interesting? Is it a "worthy hack"? (especially since Linux has > > something like it.. :-) > > I had been intending to play with this under iijppp but never did. Since > the "tun" device brings an IP interface into userland, one should be able to > do whatever one pleases at that level... including writing alternative > transport mechanisms that do load balancing. > > :-) Yep.. I'd thought about this too. I also had an evil idea on how to get around lossy/saturated international internet links. Use if_tun to get datagrams out to userspace, and encapsulate them in UDP packets for transmission to a daemon on freefall, redundantly transmitting each UDP packet two or three times, or with a non-backoff retransmission algorithm... Desperate things for desperate times... Quite anti-social I know, but doing interactive work over a link that's doing 70% packet drop is extremely painful. :-( TCP is doing so much backoff that it's practically useless. (BTW: if there's an easy way to violate the RFC's by clamp the maximum TCP retransmission values I'd love to know...) -Peter > ... Joe > > ------------------------------------------------------------------------------- > Joe Greco - Systems Administrator jgreco@ns.sol.net > Solaria Public Access UNIX - Milwaukee, WI 414/342-4847 >