Maint: common no port forwarding implementation

internal/provider/ivpn/provider.go

@@ -3,17 +3,21 @@ package ivpn
 import (
 	"math/rand"
 
+	"github.com/qdm12/gluetun/internal/constants"
 	"github.com/qdm12/gluetun/internal/models"
+	"github.com/qdm12/gluetun/internal/provider/utils"
 )
 
 type Ivpn struct {
 	servers    []models.IvpnServer
 	randSource rand.Source
+	utils.NoPortForwarder
 }
 
 func New(servers []models.IvpnServer, randSource rand.Source) *Ivpn {
 	return &Ivpn{
-		servers:    servers,
-		randSource: randSource,
+		servers:         servers,
+		randSource:      randSource,
+		NoPortForwarder: utils.NewNoPortForwarding(constants.Ivpn),
 	}
 }