[atlas] 1msec RTT to ipv6.google.com?

On Tue, 21 Jul 2015 13:31:33 +0200
Jen Linkova <furry13 at gmail.com> wrote:

> On Tue, Jul 21, 2015 at 12:33 PM, Roman Mamedov <rm at romanrm.net> wrote:
> > On Tue, 21 Jul 2015 09:37:13 +0000
> > "Abreu, Alexandre, Vodafone Portugal" <alexandre.abreu at vodafone.com> wrote:
> >
> >> Based on your feedback I've built a probe with the IP address instead of the hostname and I now get "normal" results. There's something weird about the DNS resolution that is leading to these results.
> >
> > Read about: https://peering.google.com/about/ggc.html
> >
> > Your probe may have resolved ipv6.google.com to the IP of your ISP's Google
> > Global Cache mirror, hence the very low ping.
> 
> Does not look like that as the address is 2a00:1450:4003:806::200e
> which is Google VIP in Europe.

From the original message:

> I've setup a ping probe (ID#2143865) to ipv6.google.com and it's consistently giving 1msec RTT
> RTT I get on the CPE the probe is connected to
>    0 2a00:1450:4003:806::200e                   56  59 12ms  echo reply

My guess is that maybe the probe was set up to use a different DNS resolver
than the CPE, and it got a different IPv6 instead of 2a00:1450:4003:806::200e.

-- 
With respect,
Roman
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