2018-06-13 03:31:37 +02:00
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# NAT Traversal
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`lnd` has support for NAT traversal using a number of different techniques. At
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the time of writing this documentation, UPnP and NAT-PMP are supported. NAT
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traversal can be enabled through `lnd`'s `--nat` flag.
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```shell
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2021-01-17 14:58:57 +01:00
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⛰ lnd ... --nat
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2018-06-13 03:31:37 +02:00
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```
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On startup, `lnd` will try the different techniques until one is found that's
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supported by your hardware. The underlying dependencies used for these
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techniques rely on using system-specific binaries in order to detect your
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gateway device's address. This is needed because we need to be able to reach the
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gateway device to determine if it supports the specific NAT traversal technique
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currently being tried. Because of this, due to uncommon setups, it is possible
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that these binaries are not found in your system. If this is case, `lnd` will
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exit stating such error.
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As a bonus, `lnd` spawns a background thread that automatically detects IP
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address changes and propagates the new address update to the rest of the
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network. This is especially beneficial for users who were provided dynamic IP
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addresses from their internet service provider.
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