[atlas] AS number in traceroute data

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