[SOLVED] NAT config not working in Proxmox [VM cannot access internet]

[proxnoober]

Dear all,

EDIT: RESOLVED FINALLY !!!

I changed the 'vmbr0' to 'eno1' in the NAT configuration. Worked after rebooting the node. Now VM has internet access.

I have a requirement to setup multiple VMs in different isolated networks. Also, these VMs should be able to have internet access. So far I have done the following. I am trying to fix the internet issue. I am running ubuntu server 22.04.4 LTS (Jammy Jellyfish). Proxmox host have internet access.

• created new bridge (vmbr1) for NAT and assigned IP 192.168.100.1/24.
• Edited the /etc/network/interfaces file in the proxmox server (host).

Added the vmbr1 as the network bridge to the VM

IP details of the VM which is connected to vmbr1

/etc/netplan config file

However, when I run netplan apply i get the below error. But, when I click enter it accept the changes

I am not sure why still the VM cannot access internet.

I followed the below resource

The only difference is here the eno1 is configured with a public IP and vmbr0 is with a private IP. In my case, vmbr0 was automatically setup in installation. So I created vmbr1 as a new bridge and applied the settings accordingly.

Finally iptables-save output is as below. Taken from proxmox node (host)

Any help would be greatly appreciated. I am trying to figure out the issue. Thank you!