Add endpoint independent nat support for tun inbound

constant/timeout.go

@@ -11,4 +11,5 @@ const (
 	DNSTimeout             = 10 * time.Second
 	QUICTimeout            = 30 * time.Second
 	STUNTimeout            = 15 * time.Second
+	UDPTimeout             = 5 * time.Minute
 )