config-example: add configuration for a dual-stack tailnet

config-example.yaml

@@ -22,6 +22,13 @@ listen_addr: 0.0.0.0:8080
 # autogenerated if it's missing
 private_key_path: /var/lib/headscale/private.key
 
+# List of IP prefixes to allocate tailaddresses from.
+# Each prefix consists of either an IPv4 or IPv6 address,
+# and the associated prefix length, delimited by a slash.
+ip_prefixes:
+  - fd7a:115c:a1e0::/48
+  - 100.64.0.0/10
+
 # DERP is a relay system that Tailscale uses when a direct
 # connection cannot be established.
 # https://tailscale.com/blog/how-tailscale-works/#encrypted-tcp-relays-derp