diff --git a/internal/db/db.go b/internal/db/db.go
index 71d4f45..82835af 100644
--- a/internal/db/db.go
+++ b/internal/db/db.go
@@ -105,12 +105,17 @@ func seedDefaultAdmin(cfg *config.DatabaseConfig) error {
 func seedDefaultVpnSettings() error {
 	var s model.VpnSetting
 	if err := DB.First(&s, model.VpnSettingSingletonID).Error; err == nil {
+		if s.Subnet6 == "" {
+			s.Subnet6 = "fd00:dead:beef::/112"
+			DB.Save(&s)
+		}
 		return nil
 	}
 	s = model.VpnSetting{
 		ID:               model.VpnSettingSingletonID,
 		Enabled:          false,
 		Subnet:           "192.168.77.0/24",
+		Subnet6:          "fd00:dead:beef::/112",
 		MTU:              1420,
 		InterfaceName:    "",
 		DoLocalIPConfig:  true,