tldr/pages/common/fastd.md

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# fastd
> VPN daemon.
> Works on Layer 2 or Layer 3, supports different encryption methods, used by Freifunk.
> More information: <https://fastd.readthedocs.io/en/stable/>.
- Start `fastd` with a specific configuration file:
`fastd --config {{path/to/fastd.conf}}`
- Start a Layer 3 VPN with an MTU of 1400, loading the rest of the configuration parameters from a file:
`fastd --mode {{tap}} --mtu {{1400}} --config {{path/to/fastd.conf}}`
- Validate a configuration file:
`fastd --verify-config --config {{path/to/fastd.conf}}`
- Generate a new key:
`fastd --generate-key`
- Show the public key to a private key in a configuration file:
`fastd --show-key --config {{path/to/fastd.conf}}`
- Show the current version::
`fastd -v`