Matteo:

 Are you 100% sure the probe has a v6 address or if v6 is working overall?
Do you have native v6 or tunneled? Not that it matters, other than the tunnel could be down.
I also don't see any v6 tags on your probe's page (ie: v6 Works or Resolves AAAA Correctly).

 Here is my probe with v6 working and I've got a v6 tunnel running:  https://atlas.ripe.net/probes/10378/

 What is your probe's v6 address? Maybe we can all see if it's pingable.

On Wed, Nov 5, 2014 at 10:10 AM, Matteo Bonora <matteo@bonora.eu> wrote:
Hello,

I have noticed that my probe (#14602) doesn't perform the IPv6 built-in measurements since about 5 months.

The probe has working IPv6 connectivity, so I can't understand where is the problem.

Anyone has an idea about what can I do to solve this?

(below you can see some graphs of my probe's measurements. The brief packet loss on IPv4 was due to a temporary network outage)

Thanks for your help!

Matteo