My Proxmox cannot PING anything

my working /etc/network/interfaces
auto lo
iface lo inet loopback
iface enp3s0f0 inet manual
iface enp3s0f1 inet manual
auto eth0
iface eth0 inet static

address xx.xx.xx.xx
netmask xx.xx.xx.xx
gateway xx.xx.xx.xx
bridge-ports enp3s0f0
bridge-stp off
bridge-fd 0
dns-nameservers xx.xx.xx.xx
....
 
There are no duplicate ip addresses, the box has a static ip (192.168.1.100) and Proxmox has a DHCP assigned address (192.168.1.4)

I'm a little confused by this since you don't mention "the box" or the 192.168.1.100 address anywhere else. Are you virtualizing Proxmox inside another hypervisor?

traceroute 8.8.8.8..
Bash:
root@DELLBOY:~# traceroute google.com
google.com: Temporary failure in name resolution
Cannot handle "host" cmdline arg `google.com' on position 1 (argc 1)
root@DELLBOY:~# traceroute 8.8.8.8
traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets
 1  192.168.1.1 (192.168.1.1)  0.692 ms  0.632 ms  0.598 ms
 2  * * *
 3  * * *
 4  * * *
 5  * * *


Assuming 192.168.1.1 is your router and that other machines on your network have full internet access, is it possible you've restricted the 192.168.1.4 at your router or added firewall rules in proxmox on the DELLBOY node that restrict incomming data from 192.168.1.0/24 addresses?
 
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