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+---
+title: "wireguard"
+tags: [ "Documentation", "Networking" ]
+---
+<!--
+from 
+https://engineerworkshop.com/blog/how-to-set-up-wireguard-on-a-raspberry-pi/
+-->
+
+## On Server
+
+Install `wireguard-tools` on the server.
+
+> sudo -i
+
+> cd /etc/wireguard
+
+umask 077
+
+> wg genkey | tee server_private_key | wg pubkey > server_public_key
+
+> wg genkey | tee client_private_key | wg pubkey > client_public_key
+
+    echo "
+    [Interface]
+    Address = 10.0.0.1/24
+    SaveConfig = true
+    PrivateKey = $(cat server_private_key)
+    ListenPort = 51900
+    
+    PostUp = iptables -A FORWARD -i %i -j ACCEPT; iptables -A FORWARD -o %i -j ACCEPT; iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
+    PostDown = iptables -D FORWARD -i %i -j ACCEPT; iptables -D FORWARD -o %i -j ACCEPT; iptables -t nat -D POSTROUTING -o eth0 -j MASQUERADE
+    
+    [Peer]
+    PublicKey = $(cat client_public_key)
+    AllowedIPs = 10.0.0.2/32
+    " > /etc/wireguard/wg0.conf
+
+> echo 'net.ipv4.ip_forward=1' > /etc/sysctl.d/wg.conf
+
+> systemctl enable --now wg-quiqck@wg0
+
+> chown -R root:root /etc/wireguard/
+
+> chmod -R og-rwx /etc/wireguard/\*
+
+Forward traffic from port 51900 to the server.
+
+## Client
+
+Be root.
+
+Install `wireguard-tools` on the client.
+
+Copy the client private key and server public key to the server (or just fill in the variables).
+
+> server_ip=*your server's public ip*
+
+    echo "
+    [Interface]
+    Address = 10.0.0.2/32
+    PrivateKey = $(cat client_private_key)
+    DNS = 9.9.9.9
+    
+    [Peer]
+    PublicKey = $(cat server_public_key)
+    Endpoint = $(echo $server_ip:51900)
+    AllowedIPs = 0.0.0.0/0, ::/0
+    " > /etc/wireguard/wg0-client.conf
+
+> wg-quick up wg0-client
+
+## Extras
+
+### Multiple Peers
+
+Add multiple peers by copying the `[peer]` section (they each get called `peer`).
+
+### Make a QR Code for Mobile Users
+
+Make a standard client configuration, then:
+
+> qrencode -t ansiutf8 < /etc/wireguard/mobile_user.conf