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28 lines
1 KiB
Markdown
28 lines
1 KiB
Markdown
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---
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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: "I2P's Secure Semi-reliable UDP layer"
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---
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### The Basics
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*Secure Semi-reliable UDP* (SSU) is one of two encrypted @transport layers for @Kovri/@I2P.
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SSU's *primary* purpose is to securely transmit @in-net @I2NP messages through @tunnels over encrypted [UDP](https://en.wikipedia.org/wiki/User_Datagram_Protocol).
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### In-depth information
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- Much like its @NTCP counterpart, 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 + peer testing)
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- NAT traversal (using introducers)
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- Firewall status
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- 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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