[SOLVED] Other WAN / Public IPs not reachable from VMs in NAT Network

[TaktischerSpeck]

Hello,
I use Proxmox on a Hetzner Dedicated Server with the Following Setup:

Dedicated-Proxmox, vmbr0: Public IP X.X.X.117, vmbr1: Internal NAT IP 192.168.0.1/24
VM-Plesk (Public IP: X.X.X.110)
VM-Panel (Internal NAT IP 192.168.0.120)
VM-Host-1 (Public IP: X.X.X.113)

Plesk is Running Debian, Panel Ubuntu 22.04.1.

From the Panel I can Ping:
1.1.1.1
8.8.8.8
Gateway for Subnet
X.X.X.117(Proxmox)

Every other IP of the Subnet except for I cant ping:

X.X.X.110
X.X.X.113
Also a ping to a DNS record or a wget does not work.
.110 and .113can Ping / SSH to 192.168.0.120

Any idea how i can fix that / what i am doing wrong?

 

[TaktischerSpeck]

Do you know the moment you look away from a problem for some time and then look back, and you have a new idea?

I added a route on the Proxmox machine, and now it works.
I think the issue is that the Public IP VMs are connected to vmbr0 and the internal network is on another vNIC vmbr1.

So I just executed this:
ip route add X.X.X.110/32 dev vmbr0
ip route add X.X.X.113/32 dev vmbr0

This only is active until the next restart, so I added this in /etc/network/interfaces

post-up ip route add X.X.X.110/32 dev vmbr0
post-up ip route add X.X.X.113/32 dev vmbr0