After a reboot for a kernel update, ganeti2001 has no network connectivity, I can see the interface up when logging in over the serial console, maybe a broken cable which died during reboot?
An mtr to the server is failing like this:
1. ae1-100.cr2-esams.wikimedia.org 0.0% 71 0.4 0.7 0.2 15.3 1.9 2. xe-4-1-3.cr2-eqiad.wikimedia.org 0.0% 71 83.4 83.6 83.3 90.9 0.9 3. xe-5-0-1.cr2-codfw.wikimedia.org 90.0% 71 2118. 2118. 2117. 2120. 1.2 4. ???
(I initially assumed this was a regression caused by a change between Linux 4.9.168 and 4.9.189, but I also rebooted with the old kernel and it's also happening there)