Update cheatsheets

fastd

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# 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`