Guard (entry)
- Knows
- Your IP address
- Does not know
- Where your traffic is going
Tor (The Onion Router) is a free, volunteer-run network that hides who is talking to whom by sending traffic through three relays, each of which knows only the hop before and after it. Websites see the IP of the final relay, called the exit node.
The Tor client picks a path, or circuit, of three relays from a public directory: a guard, a middle relay and an exit. It wraps the data in three layers of encryption, one per relay. Each relay peels off its layer and passes the rest on, so the guard knows your IP but not the destination, and the exit knows the destination but not you.
Circuits are reused for a few minutes and then rebuilt. Sites ending in .onion are reached without an exit at all, inside the network. Apps connect to Tor through a local SOCKS5 port, 127.0.0.1:9050 for the Tor service or 9150 for Tor Browser.
Tor is built for anonymity and censorship resistance, and it is very good at that. It is a poor fit for business proxy work, by design:
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Setup guides and best practices from the CleanProxies blog.
Terms that come up alongside Tor.
Straight answers about Tor.
The Onion Router, after the layers of encryption that each relay peels away like the skin of an onion.