[PVE-User] Proxmox 6 loses network every 24 hours

[Gerald Brandt]

Hi,

I have a Proxmox 6 server at SoYouStart https://www.soyoustart.com. I've 
been running a server there for years, running Proxmox 4. Instead of 
upgrading, I backed up all my VMs, did a fresh Proxmox 6 install, and 
restored my VMs. It works well, except for NFS, but that's another topic.


Every 24 hours, vmbr0 disappears. The SoYouStart staff can't ping the 
machine, assume it's gone down, and hard reboot the server. 24 hours 
after it's up, the cycle repeats. I'm not sure what is going on.

One weird thing, is that vmbr0 isn't configured in Proxmox, SoYouStart 
has it configured some other way. Could this be part of the problem? It 
looks like vmbr0 gets its IP via DHCP. (Yup, check in 
/etc/network/interfaces)

Apr 15 21:32:32 ns500184 ifup[695]: DHCPDISCOVER on vmbr0 to 255.255.255.255 port 67 interval 7
Apr 15 21:32:32 ns500184 dhclient[744]: Sending on   LPF/vmbr0/00:25:90:7b:a2:b8
Apr 15 21:32:32 ns500184 dhclient[744]: DHCPDISCOVER on vmbr0 to 255.255.255.255 port 67 interval 7
Apr 15 21:32:32 ns500184 dhclient[744]: DHCPDISCOVER on vmbr0 to 255.255.255.255 port 67 interval 13
Apr 15 21:32:32 ns500184 ifup[695]: DHCPDISCOVER on vmbr0 to 255.255.255.255 port 67 interval 13
Apr 15 21:32:32 ns500184 ifup[695]: DHCPREQUEST for x.x.x.x on vmbr0 to 255.255.255.255 port 67
Apr 15 21:32:32 ns500184 dhclient[744]: DHCPREQUEST for x.x.x.x on vmbr0 to 255.255.255.255 port 67
Apr 15 21:32:32 ns500184 cloud-init[819]: ci-info: | vmbr0  |  True |         x.x.x.x        | 255.255.255.0 | global | 00:25:90:7b:a2:b8 |
Apr 15 21:32:32 ns500184 cloud-init[819]: ci-info: | vmbr0  |  True | xxxxxxxxxxxxxxxxxxx/64 |       .       |  link  | 00:25:90:7b:a2:b8 |
Apr 15 21:32:32 ns500184 cloud-init[819]: ci-info: |   0   |    0.0.0.0    | x.x.x.254 |    0.0.0.0    |   vmbr0   |   UG  |
Apr 15 21:32:32 ns500184 cloud-init[819]: ci-info: |   1   |   x.x.x.0  |   0.0.0.0    | 255.255.255.0 |   vmbr0   |   U   |
Apr 15 21:32:32 ns500184 cloud-init[819]: ci-info: |   1   |  fe80::/64  |    ::   |   vmbr0   |   U   |
Apr 15 21:32:32 ns500184 cloud-init[819]: ci-info: |   3   |    local    |    ::   |   vmbr0   |   U   |
Apr 15 21:32:32 ns500184 cloud-init[819]: ci-info: |   4   |   ff00::/8  |    ::   |   vmbr0   |   U   |
Apr 15 21:32:32 ns500184 ntpd[891]: Listen normally on 3 vmbr0 x.x.x.x:123
Apr 15 21:32:32 ns500184 ntpd[891]: Listen normally on 5 vmbr0 [xxxxxxxxxx]:123
Apr 15 21:32:32 ns500184 kernel: [   12.212574] vmbr0: port 1(enp1s0) entered blocking state
Apr 15 21:32:32 ns500184 kernel: [   12.212639] vmbr0: port 1(enp1s0) entered disabled state
Apr 15 21:32:32 ns500184 kernel: [   15.603713] vmbr0: port 1(enp1s0) entered blocking state
Apr 15 21:32:32 ns500184 kernel: [   15.603773] vmbr0: port 1(enp1s0) entered forwarding state
Apr 15 21:32:32 ns500184 kernel: [   15.603914] IPv6: ADDRCONF(NETDEV_CHANGE): vmbr0: link becomes ready
Apr 15 21:32:47 ns500184 kernel: [   35.452560] vmbr0: port 2(tap5000i0) entered blocking state
Apr 15 21:32:47 ns500184 kernel: [   35.452608] vmbr0: port 2(tap5000i0) entered disabled state
Apr 15 21:32:47 ns500184 kernel: [   35.452772] vmbr0: port 2(tap5000i0) entered blocking state
Apr 15 21:32:47 ns500184 kernel: [   35.452819] vmbr0: port 2(tap5000i0) entered forwarding state

Gerald



proxmox-ve: 6.1-2 (running kernel: 5.3.18-3-pve)
pve-manager: 6.1-8 (running version: 6.1-8/806edfe1)
pve-kernel-helper: 6.1-8
pve-kernel-5.3: 6.1-6
pve-kernel-5.0: 6.0-11
pve-kernel-5.3.18-3-pve: 5.3.18-3
pve-kernel-5.0.21-5-pve: 5.0.21-10
ceph-fuse: 12.2.11+dfsg1-2.1+b1
corosync: 3.0.3-pve1
criu: 3.11-3
glusterfs-client: 5.5-3
ifupdown: 0.8.35
libjs-extjs: 6.0.1-10
libknet1: 1.15-pve1
libpve-access-control: 6.0-6
libpve-apiclient-perl: 3.0-3
libpve-common-perl: 6.0-17
libpve-guest-common-perl: 3.0-5
libpve-http-server-perl: 3.0-5
libpve-storage-perl: 6.1-5
libqb0: 1.0.5-1
libspice-server1: 0.14.2-4~pve6+1
lvm2: 2.03.02-pve4
lxc-pve: 3.2.1-1
lxcfs: 4.0.1-pve1
novnc-pve: 1.1.0-1
proxmox-mini-journalreader: 1.1-1
proxmox-widget-toolkit: 2.1-3
pve-cluster: 6.1-4
pve-container: 3.0-23
pve-docs: 6.1-6
pve-edk2-firmware: 2.20200229-1
pve-firewall: 4.0-10
pve-firmware: 3.0-7
pve-ha-manager: 3.0-9
pve-i18n: 2.0-4
pve-qemu-kvm: 4.1.1-4
pve-xtermjs: 4.3.0-1
pve-zsync: 2.0-3
qemu-server: 6.1-7
smartmontools: 7.1-pve2
spiceterm: 3.1-1
vncterm: 1.6-1
zfsutils-linux: 0.8.3-pve1