When running SSH services inside a container or virtual machine, you may want to restrict access to specific IP addresses. This blog post walks you through creating an IPTables script to forward and secure SSH access on your server. The Use Case Imagine you have: A Proxmox server with an LXC container running SSH. The external port 2222 on the host forwarding to the container’s SSH port 22. A need to allow access only from a specific IP address (e.