From your post we can not help. There is no question at all ;-)
Please start by giving us some more information, like the copy-n-pasted output of some commands, run on a PVE host (either via SSH or via "Datacenter --> <one Node> --> Shell", both ways allow copy-n-paste):
PVE System information:
Basic network information:
-
ip address show
# currently active IP addresses on one NODE
-
ip route show
# currently active routing table on one NODE
-
ip link show
# currently active links on one NODE
-
cat /etc/network/interfaces
# configuration of the network and/or ifquery -a
for comparison from one NODE
-
cat /etc/resolv.conf
# DNS resolver settings
-
ping -c 1 -W 1 9.9.9.9
# a simple "ping" to verify outgoing routing
-
host quad9.net
# a simple DNS lookup to verify reachable DNS servers
Problematic VM:
-
export VMID=<the_ID_of_the_VM>; qm config --current true ${VMID}
# the configuration of that VM
And from
inside that VM, Basic network information:
-
ip address show
# currently active IP addresses
-
ip route show
# currently active routing table
-
cat /etc/network/interfaces
# Debian et all
-
head -n -0 /etc/netplan/*
# Ubuntu
Those are examples. You may add/edit commands and options if you can enrich the information given. Oh, and please put each command in a separate
[CODE]...[/CODE]
-block for better readability.