diff --git a/bundles/wireguard/metadata.py b/bundles/wireguard/metadata.py
index 9d1d4c8..13cd9e3 100644
--- a/bundles/wireguard/metadata.py
+++ b/bundles/wireguard/metadata.py
@@ -39,6 +39,7 @@ def systemd_networkd_networks(metadata):
         'Route': {
             'Destination': str(ip_interface(metadata.get('wireguard/my_ip')).network),
             'GatewayOnlink': 'yes',
+            'PreferredSource': str(ip_interface(metadata.get('network/internal/ipv4')).ip),
         },
         'Network': {
             'DHCP': 'no',
@@ -54,6 +55,7 @@ def systemd_networkd_networks(metadata):
                     'Destination': route,
                     'Gateway': str(ip_interface(repo.get_node(peer).metadata.get(f'wireguard/my_ip')).ip),
                     'GatewayOnlink': 'yes',
+                    'PreferredSource': str(ip_interface(metadata.get('network/internal/ipv4')).ip),
                 }
             })
 
diff --git a/nodes/netcup.secondary.py b/nodes/netcup.secondary.py
index ff520e6..9a45c6d 100644
--- a/nodes/netcup.secondary.py
+++ b/nodes/netcup.secondary.py
@@ -18,7 +18,7 @@
             },
             'internal': {
                 'interface': 'eth1',
-                'ipv4': '10.0.11.2',
+                'ipv4': '10.0.11.2/24',
             },
         },
         'wireguard': {