Make clients prefer IPv6 (#1822)

Change IPv6 addresses to non-ULA addresses such that they are favored over IPv4.

config.cfg

@@ -116,7 +116,7 @@ strongswan_log_level: 2
 # ipv4
 strongswan_network: 10.19.48.0/24
 # ipv6
-strongswan_network_ipv6: 'fd9d:bc11:4020::/48'
+strongswan_network_ipv6: '2001:db8:4160::/48'
 
 # If you're behind NAT or a firewall and you want to receive incoming connections long after network traffic has gone silent.
 # This option will keep the "connection" open in the eyes of NAT.
@@ -125,7 +125,7 @@ wireguard_PersistentKeepalive: 0
 
 # WireGuard network configuration
 wireguard_network_ipv4: 10.19.49.0/24
-wireguard_network_ipv6: fd9d:bc11:4021::/48
+wireguard_network_ipv6: 2001:db8:a160::/48
 
 # Randomly generated IP address for the local dns resolver
 local_service_ip: "{{ '172.16.0.1' | ipmath(1048573 | random(seed=algo_server_name + ansible_fqdn)) }}"