Direct answer

When diagnosing or configuring a VPN, the key concepts are how IP addresses are used, what a VPN can and cannot change, and how privacy is affected. A VPN typically reroutes your internet traffic through a VPN endpoint so that many websites and online services see the VPN’s IP address rather than your local one. Privacy is improved in some contexts, but it is not guaranteed, because other signals (such as accounts, cookies, browser/device identifiers, and network conditions) can still link activity to you.

How it works

An IP address identifies devices for network communication. In normal browsing, a service may observe the public IP address of your connection path, which is often your ISP-assigned address. With a VPN enabled, your device sends traffic to the VPN endpoint first; from the service’s perspective, the source is usually the VPN IP.

Two more concepts often matter during setup:

  • DNS behavior: domain name lookups can be performed by your operating system, your router, or through the VPN depending on configuration. If DNS requests leak outside the tunnel, services may infer destinations even if traffic is tunneled.
  • Routing and “tunnel” conditions: the VPN must be active and the correct network interfaces must route traffic through it. If routing fails, some apps may bypass the VPN.

Practical context for configuration and diagnostics

Start by defining what “working” means for you: “the service should see a different external IP” and “your traffic should go through the VPN.” Then:

  • Compare your apparent IP address with the VPN on and off using an IP-checking page.
  • Check DNS-related behavior (for example, whether DNS queries and name resolution appear to follow VPN settings).
  • Validate connection status and basic logs inside the VPN client (connected, last handshake, and any disconnection/reconnect events).

If a specific app still behaves differently, consider per-app routing, firewall rules, or network profiles on your device.

Limitations

A VPN does not guarantee anonymity, safety, or access. Performance and availability can vary by network, device, location, provider, and time.