How to Choose Faster Specific Relays in Tor

While the Tor network is designed to route traffic through an automatically chosen, randomized three-node circuit for maximum privacy, it is technically possible to manually configure specific, faster relays. However, overriding Tor’s default path selection algorithm requires editing configuration files and introduces significant security and anonymity risks. This article covers how Tor chooses relays, how to manually select specific nodes, and the security consequences of doing so.

How Tor Selects Relays by Default

Tor automatically selects a three-hop circuit comprising a Guard (entry) node, a Middle node, and an Exit node. Tor’s path-selection algorithm chooses these relays based on a consensus document published by directory authorities. This system weights relays based on their advertised bandwidth and reliability to balance the load across the entire network while preventing malicious nodes from easily positioning themselves along your path.

How to Manually Specify Specific Relays

Advanced users can force Tor to use specific nodes by modifying the torrc configuration file. You can define specific entry, middle, or exit relays using their node nicknames or 40-character hexadecimal fingerprints.

To specify relays, you add rules such as:

• EntryNodes $fingerprint, $fingerprint — Directs Tor to use designated nodes as your entry point.
• ExitNodes $fingerprint, $fingerprint — Directs Tor to use designated nodes as your exit point.
• StrictNodes 1 — Forces Tor to fail connections if the specified nodes are unavailable, rather than falling back to default routing.

Finding fast relays can be done using public metrics tools like Tor Metrics, where relays are ranked by bandwidth capacity and uptime.

The Risks of Choosing Your Own Relays

Manually overriding relay selection compromises the core protections of the Tor network:

• Deanonymization and Profiling: Tor relies on uniform behavior across all users. Customizing your circuit creates a unique fingerprint that makes your traffic stand out from regular Tor users.
• Malicious Relay Exposure: If you choose a compromised or colluding entry and exit node, an attacker can perform traffic correlation attacks and uncover your real IP address and destination.
• Network Degradation: Overloading high-bandwidth relays manually disrupts the network’s automated load balancing, degrading performance for other users.

Safer Ways to Improve Tor Speeds

Rather than manually forcing specific relays, consider these safer methods to improve connection speed:

• Use the “New Circuit for this Site” Feature: If a current route is slow, requesting a new circuit prompts Tor to select an alternative path through the network.
• Check Local Network Constraints: Slow speeds are often caused by local ISP throttling, low base bandwidth, or latency rather than the Tor relays themselves.
• Keep Tor Updated: New releases of Tor Browser frequently include optimizations to the path-building algorithm and overall network performance.