[atlas] AS number in traceroute data
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Peter Gervai
grinapo+ripeatlas at gmail.com
Mon Apr 29 17:09:17 CEST 2013
On Mon, Apr 29, 2013 at 3:01 PM, Rumen Svobodnikov <rumen at telecoms.bg> wrote: >> No, there's no support for this on the probes. It'd be pretty expensive >> for >> to do this on the fly, as it involves a lookup (into BGP or IRRs) for >> virtually every packet received. > Doesn't sound so hard to implement, could be done via a DNS lookup. > For instance if you want to check what is the AS for IP 1.2.3.4, you do a > DNS lookup for 4.3.2.1.whatismyas.example.com and get the result. > This will move the complexity away from the tiny probe and to a place where > some complexity wouldn't be a problem (i.e. a DNS server). Or as a real-world example: dig TXT 4.3.2.1.asn.routeviews.org or dig TXT 4.3.2.1.origin.asn.cymru.com or dig TXT 4.3.2.1.all.ascc.dnsbl.bit.nl cya, grin
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