In trying to clarify my question, I believe I had an "uh, duh" moment. If I'm trying to verify that an IP or prefix is part of an AS, I can simply run:
10310 | 195.69.144.0 | 195.69.144.0/22 | NL | YAHOO-1 - Yahoo! [09:23 AM] hkokx@hkokx ~/Desktop $ awhois 8.8.8.8 AS | IP | BGP Prefix | CC | AS Name 15169 | 8.8.8.8 | 8.8.8.0/24 | US | GOOGLE - Google Inc. and check the AS to see if it matches a given prefix. I must've been tired for not catching that before :( I don't think there's any *need* to grab a full list of prefixes for an AS to accomplish this task. -- Hans Kokx On Friday, March 29, 2013 at 7:56 AM, Michael Douglas wrote: > If you know Cisco IOS at all you could query a public route server for > whatever command output you could want. Easily scriptable with expect. > > This project maintains a bunch of routers with open CLI access for show > commands, and full internet BGP tables from multiple providers: > http://www.routeviews.org/ > > Typically one would use a regex for the AS number & AS path. > > route-views>sh ip bgp | inc ? > LINE Regular Expression > > show ip bgp | inc _701$ <-this gives you all the prefixes originated with AS > 701 (UUNet) at the end of the AS path. > > I'm not sure what it is you're trying to accomplish, or if this would even be > an appropriate method. AS path filtration can get pretty complex on the > internet. Customers may have their own AS number "C" behind their ISP "B". > And ISP "A" may be in front of ISP "B" in the AS path. > > A B C <-AS path. Depending on with AS you want to see prefixes from, which > could be multiple ones, the regex syntax is going to be different. > > _B_ <- prefixes transiting AS B > _C$ <- prefixes originating from AS C; which would be a subset of what is > transiting B > > This goes into the syntax and issues with BGP AS path filtration with regex: > http://blog.ine.com/tag/as-path/ > > Actually, the robtex swiss army knife might be a lot easier to use, but it's > web based. > > http://www.robtex.com/ AS701 example http://as.robtex.com/as701.html > > Regards, > michael.douglas<at>ieee.org (http://ieee.org) > ccie #26817 || cissp-issap #69713 > > _______________________________________________ > Pauldotcom mailing list > [email protected] (mailto:[email protected]) > http://mail.pauldotcom.com/cgi-bin/mailman/listinfo/pauldotcom > Main Web Site: http://pauldotcom.com > >
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