Date: Thu, 21 Dec 1995 12:24:33 -0500 From: dennis@etinc.com (dennis) To: Stephen Melvin <melvin@zytek.com> Cc: hackers@freebsd.org Subject: Re: User space PPP & leased line Message-ID: <199512211724.MAA01808@etinc.com>
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>>> We tried using the user mode PPP on our systems for a while, but under >>> very heavy load after 2-3 minutes the line ALWAYS dropped. No indication >>> of what caused it. We use the identical setup with the kernel PPP (pppd) >>> and run for days with no line drops. >> >>This is most likely the result of dropping LCP echo packets on a busy line. >>Try adding .. >> >> disable lqr >> deny lqr >> > >Actually, it may be due to *delayed* rather than *dropped* LCP echo >packets and in that case, it would be nice to keep lqr enabled since it >will cause the line to be dropped when there really is nobody on the >other end There is no (good) reason to enable echos on a PPP line, particularly when it is clear that the implementation here is quite intrusive. You certainly don't want them on a leased line (only a knucklehead would enable them on a high speed line as they use bandwidth and intrude on the queuing mechanism for no reasonable purpose), and on dial-up physical signals are adaquate indicators. If the remote system crashes (ie does not bring PPP down gracefully), you're not going anywhere anyway..echos or not. I'm sure some mathamatition will argue that the bandwidth used in insignificant..... but from the sound of this tread I'd say that bandwidth is only 1 issue. turn them off. Dennis ---------------------------------------------------------------------------- Emerging Technologies, Inc. http://www.etinc.com Synchronous Communications Cards and Routers For Discriminating Tastes. 56k to T1 and beyond. Frame Relay, PPP, HDLC, and X.25
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