monero-site/_i18n/en/resources/moneropedia/ssu.md
2018-09-25 19:59:20 +02:00

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---
tags: ["kovri"]
terms: ["SSU"]
summary: "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](https://en.wikipedia.org/wiki/User_Datagram_Protocol).
### 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](https://geti2p.net/en/docs/transport/ssu#peerTesting))
- [NAT](https://en.wikipedia.org/wiki/Network_address_translation) traversal (using [introducers](https://geti2p.net/en/docs/transport/ssu#introduction))
- [Firewall](https://en.wikipedia.org/wiki/Firewall_%28computing%29) 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](https://geti2p.net/en/docs/transport/ssu)