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## Appendix: WireGuard
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The [snowflake-02](Survival-Guides/Snowflake-Bridge-Survival-Guide#snowflake-02-crusty) bridge uses WireGuard before the SSH port.
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Open a UDP port for WireGuard:
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```
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# vi /etc/ferm/ferm.conf
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domain (ip ip6) {
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table filter {
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chain INPUT {
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#...
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# allow WireGuard
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proto udp dport 51820 ACCEPT;
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#...
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}
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# ...
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}
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}
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```
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Install WireGuard, generate a keypair, and set up an interface. The server will be at 10.100.0.1, and the clients will be at 10.100.0.<var>X</var> for increasing values of <var>X</var>.
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<pre>
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# apt install wireguard
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# cd /etc/wireguard
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# (umask 077 && wg genkey > privatekey)
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# wg pubkey < privatekey > publickey
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# (umask 077 && vi wg0.conf)
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[Interface]
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PrivateKey = <mark><var>contents of privatekey file</var></mark>
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ListenPort = 51820
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Address = 10.100.0.1/24
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# systemctl enable --now wg-quick@wg0.service
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# etckeeper commit "wireguard"
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</pre>
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Use `wg show` to show the status of the network interface.
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To add a new client on the server, add a new `[Peer]` section to /etc/wireguard/wg0.conf, with the client's public key, and an `AllowedIPs` address with a distinct value of <code><var>X</var></code>:
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<pre>
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# vi /etc/wireguard/wg0.conf
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# <mark><var>username</var></mark>
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[Peer]
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PublicKey = <mark><var>contents of user's publickey file</var></mark>
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AllowedIPs = 10.100.0.<mark><var>X</var></mark>/32
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# systemctl restart wg-quick@wg0.service
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# etckeeper commit "Add wireguard peer 'username'"
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</pre> |
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The snowflake-01 and snowflake-02 bridges
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use WireGuard before the SSH port.
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See the [survival guide](Survival-Guides/Snowflake-Bridge-Survival-Guide#bridge-sites)
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for instructions on setting up WireGuard. |
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\ No newline at end of file |
