Criticisms
- Limited IPv6 support (the protocol specifies a 32-bit integer for the IP address and supports pseudo-headers for 128-bit IPv6 addresses)
- No mechanism for index sites to scrape an entire tracker
- This can be supported by traditional TCP scrape mechanisms, as it's not a performance issue.
- No mechanism for trackers to enforce client restrictions
- The UDP tracker protocol has no field to represent the user agent, as the HTTP protocol has. However, the convention to encode the user agent and version inside the peer_id field still applies.
- No mechanism for trackers to send warning messages
- No compression, especially problematic for large announce responses.
Read more about this topic: UDP Tracker
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