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fastd — VPN daemon. Works on Layer 2 or Layer 3, supports different encryption methods, used by Freifunk. Se

Submitted by: @import:tldr-pages·Mar 2, 2026·

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Problem

How to use the fastd command: VPN daemon. Works on Layer 2 or Layer 3, supports different encryption methods, used by Freifunk. See also: ivpn, mozillavpn, mullvad, warp-cli. More information: <https://fastd.readthedocs.io/en/stable/>.

Solution

fastd — VPN daemon. Works on Layer 2 or Layer 3, supports different encryption methods, used by Freifunk. See also: ivpn, mozillavpn, mullvad, warp-cli. More information: <https://fastd.readthedocs.io/en/stable/>.

Start fastd with a specific configuration file:

fastd {{[-c|--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 {{[-m|--mode]}} {{tap}} {{[-M|--mtu]}} {{1400}} {{[-c|--config]}} {{path/to/fastd.conf}}

Validate a configuration file:

fastd --verify-config {{[-c|--config]}} {{path/to/fastd.conf}}

Generate a new keypair:

fastd --generate-key

Show the public key to a private key in a configuration file:

fastd --show-key {{[-c|--config]}} {{path/to/fastd.conf}}

Display version:

fastd {{[-v|--version]}}

Code Snippets

Start `fastd` with a specific configuration file

fastd {{[-c|--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 {{[-m|--mode]}} {{tap}} {{[-M|--mtu]}} {{1400}} {{[-c|--config]}} {{path/to/fastd.conf}}

Validate a configuration file

fastd --verify-config {{[-c|--config]}} {{path/to/fastd.conf}}

Generate a new keypair

fastd --generate-key

Show the public key to a private key in a configuration file

fastd --show-key {{[-c|--config]}} {{path/to/fastd.conf}}

Context

tldr-pages: common/fastd

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