.. _Firewall Issues:

Firewall Issues
===============

.. _Firewall Issues - Mudfish Master Server:

Firewall Issues - Mudfish Master Server
---------------------------------------

This section describes about if you're encountering issues for Mudfish
Master Server to connect.

Using -O option
^^^^^^^^^^^^^^^

* After clicking "Start" button of Windows, moves to or find
  "Mudfish Cloud VPN" menu.

* Opens the property window of “Mudfish Launcher” icon by clicking the right
  mouse button on it.

* Modify the command which found at “Target(T)” box that as default,
  the following value is set::

  "C:\Program Files\Mudfish Cloud VPN\mudrun.exe"

* Changes the command with -O option. For example, looks like below::

  "C:\Program Files\Mudfish Cloud VPN\mudrun.exe" -O

* As result, "Target(T)" would be like below:

  .. image:: _static/VKP1V1.jpg
     :align: center

* -O option turns on a feature using IP and port of old master server.

Using -t option
^^^^^^^^^^^^^^^

* At the property window of "Mudfish Launcher" icon, modify the command
  as follows::

  "C:\Program Files\Mudfish Cloud VPN\mudrun.exe" -t

* -t option turns on a feature sending a fake HTTP request.

Firewall Issues - Mudfish Nodes
-------------------------------

This section describes information if you have a problem to communicate
with Mudfish nodes (not master server).

Changing Connection Protocol
^^^^^^^^^^^^^^^^^^^^^^^^^^^^

* As default, Mudfish could communicate with Mudfish nodes based on TCP
  (port 10008) and UDP (port 10008) based.  And default is UDP-based.

* If you feel that your connections are blocked by network firewall, you
  can change the connection protocol from one to another

  * At 'Setup -> Program', you can see these options.
  * If you're enabled :ref:`Expert Mode` , you can see more options for
    connection protocol.  For examples,

    * TCP (Port 10008)
    * TCP (Port 443)
    * TCP (Port 10006)
    * UDP (Port 10008)
    * UDP (Port 53)
    * UDP (Port 10006) 

Changing Mac Address
^^^^^^^^^^^^^^^^^^^^

Some network firewall blocks based on Mac address of your NIC card.
With googling you can find a lot of links about how to change it for
example,

 * `How (and Why) to Change Your MAC Address on Windows, Linux, and Mac`_

.. _How (and Why) to Change Your MAC Address on Windows, Linux, and Mac: https://www.howtogeek.com/192173/how-and-why-to-change-your-mac-address-on-windows-linux-and-mac/

.. image:: _static/macaddress.png
   :align: center