[atlas] Probe suddenly lost IPv6 connectivity

On 2014/08/11 16:47 , Ondřej Caletka wrote:
> Dne 11.8.2014 15:06, Ondřej Caletka napsal(a):
>> Hi,
>>
>> strange thing happened today. My probe v2 #3467 suddenly lost IPv6
>> connectivity and reconnected to the control server using IPv4. The probe
>> does not even respond to ping6 ff02::1%eth1 sent from the router.
>>
>> I wonder what could cause such behavior. I will try to reboot the probe
>> once I'll reach it.
> 
> Hi again,
> 
> at 16:09, the probe started to respond to ping6 again. Strange.

According to our logs your probe lost its IPv6 address around 11:43 UTC
and got it again around 14:10 UTC. The most likely cause is that the
probe didn't receive and router advertisements during that period. The
probe lost its default route around 10:19 UTC.

There is however the issue that the Linux kernel on the v1 and v2 probes
has a bug that it may get in a mode where it doesn't receive router
advertisement multicasts anymore. So if it happens again, it may be
worth replacing the probe with a v3 probe.

Philip