Help with single IP to Ubuntu VM

G00ber

New Member
Mar 30, 2025
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Hello, I'm a new proxmox user and could use some help figuring out an IP issue.

I have a single IP and proxmox is online since I'm able to upload the ubuntu iso just fine. I have vmbr0 which has the assigned WAN IP and gateway. I've got vmbr1 linux bridge set up with 192.168.1.1/24. Ubuntu has set ens18 to 192.168.1.100/24 but it's not able to communicate with the outside world.

I've played with the netplan and it looks fine. The machine has an IP with gateway which seems correct. I have a feeling the issue is between proxmox and the VM but I have no idea where else to look. I've been working on and off for the better part of a month so any suggestions would be appreciated.
 
you need SDN, DNAT, with simple network ex. "homelab".

# https://pve.proxmox.com/pve-docs/chapter-pvesdn.html

install
1) SDN Core
2) DHCP IPAM

see: Zones
A zone defines a virtually separated network. Zones are restricted to specific nodes and assigned permissions, in order to restrict users to a certain zone and its contained VNets.

Different technologies can be used for separation:
Simple: Isolated Bridge. A simple layer 3 routing bridge (NAT)
 
My setup is with OVH, if that matters.
Proxmox
Virtual Environment 8.3.3

It seems like this is pre-installed with anything after 8.1.
 
Last edited:
you need SDN, DNAT, with simple network ex. "homelab".

# https://pve.proxmox.com/pve-docs/chapter-pvesdn.html

install
1) SDN Core
2) DHCP IPAM

see: Zones
A zone defines a virtually separated network. Zones are restricted to specific nodes and assigned permissions, in order to restrict users to a certain zone and its contained VNets.

Different technologies can be used for separation:
Simple: Isolated Bridge. A simple layer 3 routing bridge (NAT)
It seems to me like SDN Core and DHCP IPAM need to be installed on the VM. This is difficult since there is no connectivity.