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From: Joe Greco <jgreco@brasil.moneng.mei.com>
Message-Id: <199610161706.MAA28010@brasil.moneng.mei.com>
Subject: Re: pppd reliability
To: CPELTIER@iectech.com (Chris Peltier)
Date: Wed, 16 Oct 1996 12:06:07 -0500 (CDT)
Cc: freebsd-isp@FreeBSD.org
In-Reply-To: <96Oct16.082411edt.6151@netgate.iectech.com> from "Chris Peltier" at Oct 16, 96 12:14:14 pm
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> Does anybody have any experience using pppd to run 
> dedicated 115K ppp links (ISDN application) on
> 2.1.0 release. My main concern is reliability and
> CPU loading experiences. I am considering 16550
> UART based boards and the Cyclades products.
> The router platform is  Pentium 100-133Mhz. It may
> coexist with T1 frame links. I have solid T1 frame reliability
> without system crashes. Would I jepordize this situation
> by adding serial based ppp links? I am thinking about 
> using the Motorola Bitsurfer Pro with multilink PPP in
> a host mode (if possible) to combine the two B channels
> into a 115Kbit single, spoofed ppp stream. Anybody else
> trying this? I know that the USR I modems don't support
> Multilink PPP in host mode (at least not yet). Any other
> good ISDN adapters with Multilink PPP spoofing and host
> mode support?

A P100-133 is probably a little beefy for the job, and I would
suggest you consider breaking this up into two tasks: routing
of T1 data on one machine and routing of your serial links on
another (or even more than just one).

The 16550 route will get saturated after not-too-many-ports.  
I haven't run Cyclades boards at those sorts of speeds, so I
can't comment on that.

... JG