Proxmox VM Network

Subnet = IP with .0/24 not 255.255.255.0/24

Gatway is .254 always

Network with Bridge

edit /etc/netplan

copy and back up existing file.

create a new file with nano

insert :

network:
  version: 2
  ethernets:
    eno3:
      dhcp4: no # Disable DHCP since you have static IPs
      addresses:
        - 142.44.212.192/24 # Your main static IP
        - 54.39.92.189/32  # Additional IP 1
        - 54.39.92.191/32  # Additional IP 2
        - 54.39.118.47/32  # Additional IP 3
        - 54.39.118.48/32  # Additional IP 4
        - 2607:5300:203:25c0::1/64
      routes:
        - to: 0.0.0.0/0  # Default IPv4 route
         via: 142.44.212.254
        - to: ::/0  # Default IPv6 route
         via: 2607:5300:203:25ff:ff:ff:ff:ff # Or your actual IPv6 gateway
      nameservers:
        addresses: [8.8.8.8, 1.1.1.1, 2001:41d0:3:163::1]
      accept-ra: false
      match:
        macaddress: 0c:c4:7a:c8:76:ae

Ping to test

ping -I 54.39.92.191 8.8.8.8