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26 lines
1.3 KiB
Markdown
26 lines
1.3 KiB
Markdown
---
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layout: moneropedia
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entry: "SSU"
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tags: ["kovri"]
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terms: ["SSU"]
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summary: "Secure Semi-reliable UDP: one of two Kovri transports"
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---
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### The Basics
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*Secure Semi-reliable UDP* is one of two encrypted @transports for @Kovri.
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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).
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### In-depth information
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- Like @NTCP, @SSU is a connection-oriented, point-to-point data transport
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- Termed *semi-reliable* because @SSU will repeatedly retransmit *unacknowledged* messages (up to maximum number then dropped)
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- @SSU also provides several unique services (in addition to its function as a @transport layer):
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- IP detection (local inspection or with [peer testing](https://geti2p.net/en/docs/transport/ssu#peerTesting))
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- [NAT](https://en.wikipedia.org/wiki/Network_address_translation) traversal (using [introducers](https://geti2p.net/en/docs/transport/ssu#introduction))
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- [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
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### Notes
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For further details, read @Java-I2P's [SSU](https://geti2p.net/en/docs/transport/ssu)
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