Networking · Comparison
Proxy vs VPN vs firewall
Three tools that sit between a device and the network and are often confused. A proxy relays traffic, a VPN tunnels it with encryption, and a firewall decides what may pass at all.
3 options · 8 questions side by side · updated
| Compare | Proxy | VPN | Firewall |
|---|---|---|---|
| What it is | A go-between that forwards requests | An encrypted tunnel to another network | A rule-based gatekeeper |
| Main job | Filter, cache or balance traffic | Private access and privacy | Block unwanted connections |
| Encryption | Not required; HTTPS stays as it was | Always, for everything in the tunnel | None; it only allows or blocks |
| What it covers | Usually web traffic or chosen apps | All traffic from a device or site | Everything crossing a machine or network edge |
| Hides addresses | Forward proxies hide clients, reverse proxies hide servers | Hides your address from the sites you visit | No |
| Where it runs | A server between clients and servers | A client app or router, plus a VPN server | On the machine, the router or the cloud edge |
| Examples | Squid, Nginx, Cloudflare | WireGuard, IPsec, Tailscale | ufw, Windows Defender Firewall, security groups |
| Watch out for | The operator sees any unencrypted traffic | The provider sees what the local network used to | One wrong rule can open or cut off everything |
How to choose between Proxy, VPN and Firewall
- Pick a reverse proxy to put HTTPS, caching and load balancing in front of servers, and a forward proxy to filter a network's browsing.
- Pick a VPN to reach private systems from outside or to protect traffic on networks you do not trust.
- Every server and network needs a firewall; proxies and VPNs are added on top when their jobs are needed.
The options
- ProxyA server that sits in the middle of a connection and passes traffic along: a forward proxy acts for the people browsing, a reverse proxy acts for the servers being visited.
- VPNAn encrypted tunnel between a device and another network, so traffic crosses the public internet privately, as if the device were plugged in at the other end.
- FirewallA gatekeeper that checks network traffic against a set of rules and blocks anything not allowed, such as strangers trying to reach a database or an admin login.
More comparisons
- TCP vs UDPThe internet's two transport protocols. TCP guarantees that data arrives complete and in order; UDP just sends packets and moves on, which is faster and better for anything live.
- Cookies vs localStorage vs IndexedDBThree ways a website can keep data in the visitor's browser. They differ in size, in whether the data travels to the server, and in who can read it.
- Domain vs DNS vs hostingThree things people often buy from one company and so assume are one thing. The domain is the name, DNS is the signpost from the name to a server, and hosting is the server itself.
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