[atlas] "funny" comment in pop-up display for a measurement? (v4/v6 addr mismatch)
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Wilfried Woeber
Woeber at CC.UniVie.ac.at
Thu Jan 16 13:18:02 CET 2014
Hi Philip thanks for the feedback! <blush> This was a very complex way to find out that I'm having a DNS (v6) config issue on my end. Sorry for the noise! Wilfried Philip Homburg wrote: > Hi Wilfried, > > On 2014/01/15 18:44 , Wilfried Woeber wrote: > >>Some more digging and some more confusion? >> >>Logged in, looking at "My measurements", selecting 1033944, a traceroutev6. >>Bringing up the Map tab, clicking on the green balloon in Bremen (Probe ID >>13255) with the *2* (hops) in it, pop-up comes up. Nice! >> >>But the *-comment at the bottom puzzles me, by saying: >> >>* The last address does not match the target IP (192.153.174.196) >> >>This is sort of obvious, as the address referred to is 2001:6f8:114e:4::1 >>What's the background for this behaviour? > > > The target of your measurement, wsww2.cc.univie.ac.at, has, as far as I > can tell, only an IPv4 address. So an IPv6 measurement should fail. And > in fact most probes reported: > > "result":[{"error":"name resolution failed: non-recoverable failure in > name resolution"}] > > One question that comes up is how you were able to run this measurement > in the first place. Because the system usually doesn't allow running > measurement towards targets that don't have an address for the selected > address family. > > This also why the UI complains about 192.153.174.196, because that is > the IPv4 address of wsww2.cc.univie.ac.at. > > There were 3 probes where name resolution resulted in an IPv6 address. 2 > of them have since changed their behavior and no longer resolve to an > IPv6 address. > > One probe, 13255, is rather curious, because it resolved > wsww2.cc.univie.ac.at to 2001:6f8:114e:3::c099:aec4, which is > interesting because c099:aec4 is exactly equal to the IPv4 address of > wsww2.cc.univie.ac.at. So I suspect that this probe is behind a resolver > that does DNS64. > > Philip > >
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