Date: Thu, 9 Aug 2001 23:05:59 -0700 From: "Ted Mittelstaedt" <tedm@toybox.placo.com> To: "Nick Rogness" <nick@rogness.net>, "Eric Masson" <e-masson@kisoft-services.com> Cc: <freebsd-questions@FreeBSD.ORG> Subject: RE: DSL connectivity & ISDN backup Message-ID: <004701c12162$86b05820$1401a8c0@tedm.placo.com> In-Reply-To: <Pine.BSF.4.21.0108091335110.90563-100000@cody.jharris.com>
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>-----Original Message----- >From: owner-freebsd-questions@FreeBSD.ORG >[mailto:owner-freebsd-questions@FreeBSD.ORG]On Behalf Of Nick Rogness > territory). Like Mr. Middlestaedt mentions, paying $20-$40 > a month for ADSL service will not be as reliable as a Leased line. > Unfortunately, it turns out that dial-on-demand redundancy on leased lines isn't 100% reliable either. Case in point - a customer of ours has a Frame Relay connection to us using a Cisco 1604 - the frame connection comes into a WAN card in the router, and the router is configured to bring up an ISDN call on the ISDN port in case the Frame circuit goes offline. The backup works perfectly if I stand next to the router and remove the T1 Frame circuit from the DSU card. It's also worked a few times unattended. (I loved the time they called complaining about slow Internet access and our response to them was "didn't you know your T1 was down and your running on ISDN?") But, one day the customer went offline and the ISDN circuit didn't come up. Further investigation found that the phone company had hosed up the PVC internally somewhere in their cloud - only problem is that at both ends (ours and theirs) the Telco was still merrily advertising the DLCI. Thus the router never thought that the interface on the Frame side went down and was stupidly sending traffic into a pipe that was going nowhere. And I spent at least an hour working out that particular configuration too. Sigh. >> >> It would be nice to see this kind of setup handled by ppp(8) via a new >> keyword like <backup> which parameter would be the configuration to >> use for backup. >> > > Yes, that would be nice. > Ah, yes, that would indeed. Eric - sign me up as one of your beta testers. :-) Only problem I can see is how does PPP know when the main circuit is back online? Does it keep redialing periodically or what? Ted Mittelstaedt tedm@toybox.placo.com Author of: The FreeBSD Corporate Networker's Guide Book website: http://www.freebsd-corp-net-guide.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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