[SOLVED] Proxmox 7 - Guest cannot ping host (or vice versa) with firewall enabled

[aurarius]

Hello,

I couldn't find anything here which describes exactly my problem: when I enable the Proxmox firewall on one VM and on the PVE those two cannot ping each other. When i disable the firewall on the VM, PVE can ping VM but the VM cannot ping PVE and vice versa. Funnily CIFS shares from my OMV machine are accessible from every other guest. But pinging isn't.

I really cannot think of what the problem could be, as it works when disabling the firewall.

I appreciate your help.

Thanks!

 

[ph0x]

That's because the firewall does its job: dropping packets. If you want pings, you have to allow ICMP packets, incoming and outgoing depending on the policy that you defined for host and guest.

 

[aurarius]

Thansk for the answer. I asked because I found a few people saying the firewall doesnt block ICMP packets. Now I know. Thanks again! I will mark thsi as answered.