enable derp server

compose.yml

@@ -81,6 +81,7 @@ services:
     image: headscale/headscale:0.23.0@sha256:a02592e70c12b77b7f3b99c142818f7636a44c97bfa38f678b8c9c3ae5f82895
     restart: unless-stopped
     ports:
+      - "3478:3478/udp"
       - "127.0.0.1:9200:9200"
     volumes:
       - ./etc/headscale:/etc/headscale

etc/headscale/config.yaml

@@ -9,3 +9,10 @@ noise:
 ip_prefixes:
   - fd7a:115c:a1e0::/48
   - 100.64.0.0/10
+derp:
+  server:
+    enabled: true
+    region_id: 999
+    region_code: "headscale"
+    region_name: "Headscale Embedded DERP"
+    stun_listen_addr: "0.0.0.0:3478"