What Is A Site To Site Vpn?
🔍 Quick answer:
What Is A Site To Site Vpn — Quick, practical answer to what is a site to site vpn. Here's what you need to know in 2026.
Quick technical answer
what is a site to site vpn — a precise answer requires understanding the underlying mechanism. VPNs use encrypted tunnels to route your traffic through a remote server, hiding your real IP from the destination service.
Modern VPN protocols include WireGuard (~4,000 lines of code, fastest), OpenVPN (open standard, widely supported), and IKEv2 (mobile-friendly, fast reconnects). All three use strong encryption (AES-256, ChaCha20) and provide adequate security for most use cases.
How it works
- Your device establishes an encrypted tunnel to a VPN server using a shared key or certificate
- All traffic is encapsulated inside this tunnel — your ISP sees only encrypted packets
- The VPN server decrypts the traffic and forwards it to the destination, replacing your real IP with the server's IP
- Return traffic follows the reverse path: destination to VPN server (gets your reply), then through the tunnel back to you
Key parameters
| Parameter | Typical value |
|---|---|
| Encryption | AES-256-GCM or ChaCha20-Poly1305 |
| Protocol | WireGuard (recommended) or OpenVPN |
| MTU | Usually 1420 (lower than 1500 to fit tunnel overhead) |
| DNS | Use VPN's DNS resolver, not your ISP's (prevents DNS leaks) |
| Kill switch | Yes — blocks all traffic if tunnel drops |
💡 Pro tip: Always run a leak test (dnsleaktest.com, ipleak.net) after connecting. A misconfigured VPN can leak DNS queries to your ISP even when the tunnel is active.
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Top 3 VPNs 2026 Tested
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Terms you'll meet
- IP address
- Your device's public ID online.
- Encryption
- Scrambling data so only you can read it.
- No‑logs policy
- VPN doesn't store your activity.