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Like I write, now with DHCP server turned off, check config /etc/network/interface This config should be proper for you PVE host auto lo iface lo inet loopback iface enp3s0 inet manual auto vmbr0 iface vmbr0 inet static address 192.168.1.74/24 gateway 192.168.1.1...

Change ip on vmbr77 interface to any different free ip from the same subnet. If I understand you well, now you have the same address on ztnxxxxx interface and on vmbr77 interface. You make ip confilict

Can you please share your /etc/network/interface configuration for PVE

I'm not sure that I understand your topology How is NAS connected with PVE node? I mean on physical connection. You have one switch and in one port is PVE on second is NAS or ?

You VM can resolve logical VPN server name to right ip? Do you try do turn off firewall on VM?

First thing which you can do is install tcpdump on Ubuntu VM. Then start it and look in packet that come to interface when for example do ssh from internet to that Vm via router trough NAT. I guess that you have some packet capture software or router also? In the same time start packet capture...

Can you ping default gateway 192.168.1.254 , witch is on router, from VM? If you can, network on pve is ok. internet | /------\ 192.168.1.254 |-------| router |---| \------/ | 192.168.1.XXX/24 | |----|...

Probably you have "problem" with default gateway. Any network host can have only one default gateway at a moment. You can add a static route if you wish to use one card for specific network access. If you wish to use two network card as one interface you must create bond interface. For this...

For me is simple impossible to get ip on interface if you do not set it. If you have only this nic enp3s0 and only this config for vmbr0 and you don't have any script, i think on cloudinit or similiar, is impossible to get more address on interface.

Do you enable firewall on Ubuntu VM network card? Can you ping Win PC from Ubuntu VM?

Give us more details about network configuration. PVE network config /etc/network/interfaces. Windows is not VM? How is Win PC connected with ProxMox?

If you don't have DHCP server don't put nic to get address form DHCP server. NTP is for time sync. NTP and configuration of ip address on interface is not related. This is good config auto lo iface lo inet loopback iface enp3s0 inet manual auto vmbr0 iface vmbr0 inet static address...

You say "i accidently added a router to the same nic which i was using to access proxmox" Can you explain and give us more detail about configuration?

What say output of command lsof / | grep deleted

Go tu console of server, then run commend df-h . Idea is to find some mount point that is used 100 %. When find that mount point, run du -h --max-depth 1 For example If output say /dev/mapper/pve-root 94G 85G 85G 100% / run du -h --max-depth 1 /...

Give us output from command df -h from servers

OK, Try this auto bond0 iface bond0 inet manual bond-slaves eno1 eno2 bond-miimon 100 bond-mode 802.3ad bond-xmit-hash-policy layer2 auto bond0.10 iface bond0.10 inet manual auto vmbr10 iface vmbr10 inet manual address 192.168.10.20/24 gateway...

To clarify. You wish to have bridge interface for host ip and to can connect VM's to that bridge intsrface. All this traffic must be in vlan_id 10?

Except port forwarding do you do NAT on router?

Let's start. I guess that you have some public ip and you do port forwarding to VM private ip or on proxmox node? I first case, port forwarding to VM: - do your VM have configured network params - can you ping defult gw from VM - can you ping anything from VM - do you have firewall on VM - do...