Date: Thu, 14 Jun 2007 14:44:56 -0500 From: Kevin Kinsey <kdk@daleco.biz> To: efinleywork@efinley.com Cc: freebsd-questions <freebsd-questions@freebsd.org> Subject: Re: (OT?) Anyone wanna address my ISP's issues? [CIDR/BGP question] Message-ID: <46719AB8.4030800@daleco.biz> In-Reply-To: <v75373l1o6iq7vegfca23s1ijq881me7d3@4ax.com> References: <467191DB.2010709@daleco.biz> <v75373l1o6iq7vegfca23s1ijq881me7d3@4ax.com>
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Elliot Finley wrote: > On Thu, 14 Jun 2007 14:07:07 -0500, you wrote: > >> >> The DSL modem's outside (static) IP is n.n.n.70, the gw >> is n.n.n.69, and the mask is 255.255.255.252. From >> inside, I can ping .70, but not .69 (and, needless to say, >> nothing else, either). From the outside, it's the >> other way 'round. Traceroute (from outside) shows different >> endpoints for the two addresses (that is, the last hop >> before .69 is one router, and, when looking for .70, it's >> another router (but not the one that leads to .69)). >> >> If I did my CIDR homework correctly, the net is n.n.n.68/30. >> Using "BGPlay" (http://bgplay.routeviews.org/bgplay/), I get >> the message: "The selected data sources have no information on >> prefix n.n.n.68/30. Please check that this prefix is globally >> announced." >> >> My question: shouldn't it be 'announced', if the ISP intends >> to route me TCP/IP traffic? I apologize for my ignorance, >> but BGP isn't something I figured to need to know at this >> point in my life (although, it doesn't hurt to learn, usually).... > > anything smaller than a /24 will be filtered. The ISP would announce > the larger block that your /30 lives in. Thank you very much, Elliot; You wouldn't believe how hard it's been to get anyone at, err, "tech support", to even address the issue. It makes sense, I suppose, otherwise the global routing table would be much larger than it is (?) Anyone up for further questions? The .70 --> .69 route on the modem has a metric of "5", but with the .252 mask, shouldn't it be required to be one hop away? Guess I need to head back to "class", Kevin Kinsey
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