schrieb [email protected]:
i have been running a private cloud for about a year, although i am using PVE
for 4 years but this is first time i am using it for remote cloud.
every thing is working great and nothing happen for about a year. however i
observe one issue. which is Virtual Machine lan card related,
this is not happening very frequently . but happen once in a 3 month and not on
all machines but few machines.
the problem is, VM stop reaching the LAN and WAN.
when i ping , it says "destination host unreachable"
We had a similar problem in a datacenter: We startet to ping the switch
to whom the physical network interface is connected via cronjob - and
the problem disappears. The datacenter maintainer told us, that there
could be a problem with the ARP table in the switch, when connecting
different (virtual) MAC Adresses over different VLANs on the same cable
- if there is no traffic on some of them, it may loose the cached older
MACs and does not check for new ones, because he has already an amount
of active MACs on this line.
There should be no problem with that, but obviously it was exactly the
problem - and according to your case, it could be the same, as you told
to run a private cloud for years before without that behaviour. We
experienced this only on one networkinterface - at other servers with
other LAN cards, it works properly all the time.
It is just a workaround, but myabe the solution could be only found in
the switch firmware...
Many regards,
Martin
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