Date: Tue, 21 Mar 2000 01:47:55 +1100 (EST) From: Rowan Crowe <rowan@sensation.net.au> To: Troy Settle <troy@picus.com> Cc: Craig Beasland <craig@hotmix.com.au>, freebsd-isp@FreeBSD.ORG Subject: RE: Multihoming Message-ID: <Pine.BSF.4.01.10003210132060.21403-100000@velvet.sensation.net.au> In-Reply-To: <NDBBLGJECLNPOOFNABJCAEAGCAAA.troy@picus.com>
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On Mon, 20 Mar 2000, Troy Settle wrote: > Second, ask each of your upstream providers for limited tables. Customer > and Peering routes are a good place to start. > > One trick, that might work for you, is to take *NO* routes from either > upstream. Only advertise your own routes via BGP. This will ensure that > the rest of the world always has a route back to you (assuming that at least > one provider is up :). For your outbound, configure your router to spit > packets out of both interfaces. If one goes down, the other will pick up > the slack (well, as much as possible anyways :). An addition to this is to get your upstream providers to advertise default to you. This isn't perfect, since if part of their network breaks their local router will still be advertising default, but at least it moves the point of failure back one place (ie the physical link could be up but not passing packets - static routes will continue to send packets down it, but BGP will time out and release the default) I take default only from one upstream, and default plus a couple of blocks from another. I advertise all of my blocks to both upstreams. This would probably be the sort of thing that Craig would want to do. > If you want to do this right, get yourself at least a Cisco 3620 or 3640 > (3640 will last longer), and get private line T1s to each of your providers. > You won't regret it (though your accountant might kill you over it :) *steps up onto soapbox* Pardon me while I point out a few "cultural differences", Troy. :) Note the email address of the original poster (Craig), in .AUstralia we don't have T1s, and if we did they would most likely be quite expensive, thanks to our lovely telco Telstra - a 512kbit DDS serial link is about US$2,400 a month for the p-t-p link alone... even 64k ISDN is about $US400 a month. Also in a country with a smaller population (18 million) than the USA, the definition of a "smaller" ISP is remarkably smaller, so added to the above mention of high prices you should probably scale down the suggested link sizes. :) (FWIW, I'm a "small" Australian ISP with a little over 200kbit/sec total transit bandwidth) Cheers. -- Rowan Crowe http://www.rowan.sensation.net.au/ Sensation Internet Services http://info.sensation.net.au/ Melbourne, Australia Phone: +61-3-9388-9260 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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