Remove VPN_PMTUD option

internal/configuration/settings/vpn.go

@@ -18,7 +18,6 @@ type VPN struct {
 	Provider  Provider  `json:"provider"`
 	OpenVPN   OpenVPN   `json:"openvpn"`
 	Wireguard Wireguard `json:"wireguard"`
-	PMTUD     *bool     `json:"pmtud"`
 }
 
 // TODO v4 remove pointer for receiver (because of Surfshark).
@@ -55,7 +54,6 @@ func (v *VPN) Copy() (copied VPN) {
 		Provider:  v.Provider.copy(),
 		OpenVPN:   v.OpenVPN.copy(),
 		Wireguard: v.Wireguard.copy(),
-		PMTUD:     gosettings.CopyPointer(v.PMTUD),
 	}
 }
 
@@ -64,7 +62,6 @@ func (v *VPN) OverrideWith(other VPN) {
 	v.Provider.overrideWith(other.Provider)
 	v.OpenVPN.overrideWith(other.OpenVPN)
 	v.Wireguard.overrideWith(other.Wireguard)
-	v.PMTUD = gosettings.OverrideWithPointer(v.PMTUD, other.PMTUD)
 }
 
 func (v *VPN) setDefaults() {
@@ -72,7 +69,6 @@ func (v *VPN) setDefaults() {
 	v.Provider.setDefaults()
 	v.OpenVPN.setDefaults(v.Provider.Name)
 	v.Wireguard.setDefaults(v.Provider.Name)
-	v.PMTUD = gosettings.DefaultPointer(v.PMTUD, true)
 }
 
 func (v VPN) String() string {
@@ -90,8 +86,6 @@ func (v VPN) toLinesNode() (node *gotree.Node) {
 		node.AppendNode(v.Wireguard.toLinesNode())
 	}
 
-	node.Appendf("Path MTU discovery update: %s", gosettings.BoolToYesNo(v.PMTUD))
-
 	return node
 }
 
@@ -113,10 +107,5 @@ func (v *VPN) read(r *reader.Reader) (err error) {
 		return fmt.Errorf("wireguard: %w", err)
 	}
 
-	v.PMTUD, err = r.BoolPtr("VPN_PMTUD")
-	if err != nil {
-		return err
-	}
-
 	return nil
 }