monero-site/resources/moneropedia/ssu.md
2017-07-04 00:00:32 -06:00

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SSU
Secure Semi-reliable UDP: one of two Kovri transports

The Basics

Secure Semi-reliable UDP is one of two encrypted @transports for @Kovri.

Similar to @NTCP, @SSU's primary purpose is to securely transmit @in-net @I2NP messages through @tunnels but, unlike @NTCP, @SSU functions solely over encrypted UDP.

In-depth information

  • Like @NTCP, @SSU is a connection-oriented, point-to-point data transport
  • Termed semi-reliable because @SSU will repeatedly retransmit unacknowledged messages (up to maximum number then dropped)
  • @SSU also provides several unique services (in addition to its function as a @transport layer):
    • IP detection (local inspection or with peer testing)
    • NAT traversal (using introducers)
    • Firewall status and, if implemented, @SSU can notify @NTCP if the external address or firewall status changes

Notes

For further details, read @Java-I2P's SSU