Sometimes no Network

[tzzz90]

Hello, I have a strange phenomenon on a newly installed Proxmox server. After a restart, the Proxmox server is sporadically unavailable. Neither via SSH nor via the webgui and the server cannot be pinged either. If I shut down the server and unplug and reboot, I definitely have no network. Various issues when I have no network. The server has 3 network connections, one of which is for remote management. In some cases, after I had no network connection, I plugged the cable into the second network connection and suddenly had network again, although eno0 is still bound to vmbr0 in the webgui.

Cat /etc/network/interfaces



Ethtool eno1



Ethtool eth0



Proxmox



Ip link



Pvversion
pve-manager/7.2-7/d0dd0e85 (running kernel: 5.15.30-2-pve)

 

[ftrojahn]

Same here, after upgrading from 6.4 to 7.2 some weeks ago, some reboots worked.
A week ago - no connection after reboot, always having to do "service networking restart" via console (PiKVM )
and some services which fail without network, too.

pve-manager/7.2-7/d0dd0e85 (running kernel: 5.15.39-4-pve)
Tried the older kernel 5.15.39-3-pve, too - no change.

# /etc/network/interfaces
auto lo                                                                                                                                                                                                          
iface lo inet loopback                                                                                                                                                                                            
                                                                                                                                                                                                                 
iface eno1 inet manual                                                                                                                                                                                            
                                                                                                                                                                                                                 
iface eth0 inet manual                                                                                                                                                                                            
                                                                                                                                                                                                                 
auto vmbr0                                                                                                                                                                                                        
iface vmbr0 inet static                                                                                                                                                                                          
        address 172.16.50.254/24                                                                                                                                                                                  
        gateway 172.16.50.1
        bridge-ports eno1
        bridge-stp off
        bridge-fd 0

auto vmbr0v99
iface vmbr0v99 inet static
        address 192.168.99.254/24
        bridge-ports eno1.99
        bridge-stp off
        bridge-fd 0

So doing this as workaround for now: crontab -l

@reboot systemctl restart networking && systemctl restart service1 service2

 

[vesalius]

@ftrojahn This may not be the case for you, but sudo systemctl is-enabled networking should return enabled. If not, sudo systemctl enable networking fixed it for me. Some things to try in the thread linked below.

https://forum.proxmox.com/threads/upgrade-to-7-no-network-after-reboot.101342/

 

[ftrojahn]

@ftrojahn This may not be the case for you, but sudo systemctl is-enabled networking should return enabled. If not, sudo systemctl enable networking fixed it for me.

Great, thank you. Must have missed this in the search results.

 

[tzzz90]

Thanks, this helped me a lot!