NAT configuration not working

[blcksys]

[EDIT - please move my thread to network section, I opened in wrong one]
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[EDIT2 - in order to solve it, I had to downgrade to debian 8 and use an outdated version of proxmox 4 chosing NAT option in VM setting]
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I'm getting crazy trying to get my installation of proxmox to work with NAT.

I followed about 30+ tutorials, including the official wiki, and my settings now looks like that:

/etc/network/interface on host machine:

running ifconfig on host machine:

ifconfig and ping test on guest vm:

After a thousands of attempts, reinstalls, tweaking and so on, the result are always the same, the network won't work.
The guest machine doesn't connect to the network and it's not getting an internal IP from 10.10.10.x and thus no internet access

What am doing wrong here?

If it's of any use, the server is hosted at hetzner with a single public IP address.
it uses systemd.networkd (apparently all of their images uses that).
OS is debian 10 buster.

 

[dcsapak]

your screenshot of the vm does not show any ip... do you have configured any ip from the '10.10.10.0/24' subnet in the vm?

 

[Reuven]

It is a real pity the blcksys never answered since I have the same issue and my server is at hetzner also..I installed proxmox 6.2 using the proxmox ISO....and I can get my first windows 10 VM to work

 

[blcksys]

It is a real pity the blcksys never answered since I have the same issue and my server is at hetzner also..I installed proxmox 6.2 using the proxmox ISO....and I can get my first windows 10 VM to work

Hello,
I never solved the issue, so I given up and passed to using full bridge with subnet

 

[Reuven]

so how does your /etc/network/interface looks now ?

 

[blcksys]

so how does your /etc/network/interface looks now ?

You purchase the subnet from hetzner e create the bridge for it, activate ipv4 forward and proxyarp and that's it
You can do something like this:

# device: eth0
auto  eth0
iface eth0 inet static
  address <IP from subnet]
  netmask <Netmask of subnet>
  gateway <Gateway of subnet>

You have to sacrifice an IP from subnet in order to use it (so if you have a x6 subnet, you'll only can use x5 for VMs), and you have to manually assign them to VMs

Or if you want to use NAT, do like I did, which is: downgrade to debian 8 and use an outdated version of proxmox 4 chosing NAT option in VM setting