[SOLVED] 2nd network suddenly not working anymore

M

macamba

Renowned Member
Mar 8, 2011
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I have routers physically connected to my Proxmox server:
1) DMZ: 192.168.2.x. Router: 192.168.2.254 (vmbr0)
2) LAN: 192.168.178.x Router 192.168.178.1 (vmbr1)
VM's and containers using the LAN network are still working fine. VM's and containers using the DMZ only are suddenly not reachable anymore (ingress and egress not working anymore)

The network of the Proxmox host is configured as follow:
1725446841663.png

The network of a Container in DMZ is configured as follow:
1725446989553.png
Ping from the Container to 192.168.2.254 as well as to 192.168.178.1 results in Destination Unreachable.

I haven't really changed something in the network config. The only thing is that for maintenance I had vmbr1 temporary disconnected. Support is greatly appreciated.
 
Additional info: Command 'ip a' show the following. Note that enp2s0 is missing!
1725449890737.png
 
All kind of network checks resulted in no solution. What I noticed is that enp3s0 was new in the Proxmox interface list (see screenshot above) and enp2s0 disappeared in 'ip a' (see screenshot above). Updated configuration of VMBR1 from enp2s0 to enp3s0 Port/ Slave and it works.

Of course happy that it works again but can somebody help me understand?

1725450673634.png
 

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Did you install/remove any OTHER hardware? Cause if so, it might have changed the name of the network-device because of that (and of course invalidating the current config.
If you prevent that happening in the future, the generally recommended method is to pin your network-device name based on the MAC-address. [1]
Someone even made a script [2] for it

[1] https://pve.proxmox.com/wiki/Network_Configuration#_naming_conventions
[2] https://forum.proxmox.com/threads/t...etwork-interface-renaming.153817/#post-699566
 
The maintenance I referred to above is indeed hardware maintenance. I am trying to add a pcie riser expansion card for 2 nvme ssd’s. The two nic’s I use are onboard of the motherboard. So surprised this is relates. Thanks for letting me know. Learned something.
 
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