So, I have been baffled by this issue for a few days.
Few guests are dropping most incoming packets (not all) for most of the time. The guests are recently created, and the same problem doesn't appear on older guests. If I reboot the guest, the network stays on for a few seconds and then drops - not always, sometimes it can't be pinged at all. The network works intermittently for a few seconds at random intervals.
This issue only occurs on the public network (vmbr0/eth0) and not the internal one (vmbr5) - and only with Linux, Windows guests are unaffected. The guests in question are running both Ubuntu Server 16.04 and Debian Stretch. Also, outgoing packets work perfectly fine.
The network card on eth0 is Intel 82579V, with PVE 5.1-42/724a6cb3 (Kernel 4.13.13-3-pve).
Few guests are dropping most incoming packets (not all) for most of the time. The guests are recently created, and the same problem doesn't appear on older guests. If I reboot the guest, the network stays on for a few seconds and then drops - not always, sometimes it can't be pinged at all. The network works intermittently for a few seconds at random intervals.
This issue only occurs on the public network (vmbr0/eth0) and not the internal one (vmbr5) - and only with Linux, Windows guests are unaffected. The guests in question are running both Ubuntu Server 16.04 and Debian Stretch. Also, outgoing packets work perfectly fine.
The network card on eth0 is Intel 82579V, with PVE 5.1-42/724a6cb3 (Kernel 4.13.13-3-pve).