[atlas] Probe doesn't seem to automatically recover from IPv6 connectivity failure

Hello.

Probe (v2) doesn't seem to recover from all network failures
automatically. It currently connects using IPv4 and reports IPv6 tests
as "can't send". I can't ping probe on IPv6 and it seems like it doesn't
talk IPv6 at all on that VLAN, although router sends RA's every minute.
In web interface it says that it has IPv6 address (all other things
under IPv6 are "Undetermined/Unknown") but it doesn't actually
participate in network at all. Only router talks IPv6 in that network,
according to tcpdump.

I think not recovering from IPv6 failures is a bug. Somehow, it still
recovers from IPv4 failures. Problem appeared after I had it physically
disconnected from Ethernet for some hours. Before that, probe also
didn't have connection to internet for a day. I wish I would not need to
pull the power every time this happens. Although it's rare occasion that
anything is down here.


Thanks.