+++ title = "Wireguard Gateway & Android" date = 2019-07-07T14:41:00+02:00 author = "MH" cover = "" tags = ["VPN", "Wireguard", "Android", "Setup"] description = "Setup a Linux Wireguard Gateway and connet with Android" showFullContent = false draft = false +++ # Setup your Linux Server Your Linux server should be accessible via a public IP by UDP. If the IP address changes, use DynDNS. First **install WireGuard** on your Linux server. On the official website you will find the right way for your Linux distro: [WireGuard.com/install](https://www.wireguard.com/install/) Then **configure** the Gateway. We will use the range 100.64.0.0/10 (RFC 6598) because it doesn't colide with private IPv4 adresses (RFC 1918). echo '[Interface]' > /etc/wireguard/wg0.conf echo "PrivateKey = $(wg genkey)" >> /etc/wireguard/wg0.conf echo 'ListenPort = 50002' >> /etc/wireguard/wg0.conf echo "Address = 100.64.0.1/10" >> /etc/wireguard/wg0.conf iptables -t nat -A POSTROUTING -s 100.64.0.0/10 -o eth0 -j MASQUERADE systemctl enable --now wg-quick@wg0 Don't forget to save the iptables rules for the next start. The easiest way is to use cron, but I don't recommend it. To get the public key (you need it later on): wg pubkey <<<$(grep PrivateKey /etc/wireguard/wg0.conf | cut -d ' ' -f3) Now the gateway is configured and running. To get some information, type in wg and use systemd: systemctl status wg-quick@wg0 wg show # Setup your Android Download the App from [F-Droid](https://f-droid.org/en/packages/com.wireguard.android/) or [Google Play](https://play.google.com/store/apps/details?id=com.wireguard.android). In WireGuard, you must manually set an IP address for each client. The ``100.64.0.0.0.0/10`` area has hosts from ```100.64.0.1`` to ``100.127.255.254```, the first one is already occupied by the gateway, so we use ```100.64.0.0.2````. ![]({{}}img/wireguard-android/A.jpg) | ![]({{}}img/wireguard-android/B.jpg) | ![]({{}}img/wireguard-android/C.jpg) -------|----------|-------- Open the app and "Create from scratch" | Generate a key pair. Make a note of the public key, you will need it later. Name the configuration and add the client IP address with 32 mask. | Add a peer. Now enter the gateway information. Allowed IPs is ```0.0.0.0/0```. # Add Android Client to Server Now add the client information to the gateway and restart the interface. [Peer] >> /etc/wireguard/wg0.conf PublicKey = >> /etc/wireguard/wg0.conf AllowedIPs = 100.64.0.2/32 >> /etc/wireguard/wg0.conf systemctl restart wg-quick@wg0 && systemctl status wg-quick@wg0 # Sources [Wireguard Quickstart](https://www.wireguard.com/quickstart/) Heise [Besser tunneln](https://www.heise.de/select/ct/2019/5/1551091519824850) Witepaper [WireGuard: Next Generation Kernel Network Tunnel](https://www.wireguard.com/papers/wireguard.pdf) Demo Video [Test WireGuard VPN net roaming](https://video.obermui.de/videos/watch/5009724a-a670-4130-bc99-4ab820773da6)