[atlas] AS number in traceroute data
Rumen Svobodnikov rumen at telecoms.bg
Mon Apr 29 15:01:41 CEST 2013
On Mon, 29 Apr 2013, Robert Kisteleki wrote: > On 2013.04.26. 12:14, Pavel Veselovskiy wrote: >> Hello, >> >> Is it possible to perform RIPE Atlas measurements with a key "-A" that >> shows the number of autonomous systems? >> >> - >> Kind Regards, >> Pavel Veselovskiy, >> Samara State Aerospace University > > Hello, > > 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. > > But it would be possible to annotate the results in some way, when storing > them or when you access them. Is this something that would be interesting > for others too? > > Regards, > Robert > > > PS: of course the task itself is far from trivial. Trying it out on a random > Linux box gave me the "wrong AS" for almost half of the cases. I'm sure > there could be extensive discussion around how to Do This Right in the first > place :) > > 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 18.104.22.168, you do a DNS lookup for 22.214.171.124.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).