Fix: port forwarding VPN interface specification

internal/vpn/portforward.go

@@ -22,7 +22,7 @@ func (l *Loop) startPortForwarding(ctx context.Context, data tunnelUpData) (err
 	// only used for PIA for now
 	gateway, err := l.routing.VPNLocalGatewayIP(data.vpnIntf)
 	if err != nil {
-		return fmt.Errorf("%w: %s", errObtainVPNLocalGateway, err)
+		return fmt.Errorf("%w: for interface %s: %s", errObtainVPNLocalGateway, data.vpnIntf, err)
 	}
 	l.logger.Info("VPN gateway IP address: " + gateway.String())
 

internal/vpn/run.go

@@ -40,6 +40,7 @@ func (l *Loop) Run(ctx context.Context, done chan<- struct{}) {
 			portForwarding: settings.Provider.PortForwarding.Enabled,
 			serverName:     serverName,
 			portForwarder:  providerConf,
+			vpnIntf:        settings.OpenVPN.Interface,
 		}
 
 		openvpnCtx, openvpnCancel := context.WithCancel(context.Background())