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I am having an issue connecting to a device via port forward from another network

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0

I am having some type of routing problem where I cannot
connect to a Raspberry pi via a port forward behind a Wi-Fi
router. I have a network set up consisting of a Comcast Wi-Fi
router (connected to the Internet). To extend my Wi-Fi range,
I have two additional routers, both connected to the Comcast
router via Ethernet. My network layout is below (excuse the
simple ASCII art).

• My laptop is connected via Wi-Fi to Router1 on its LAN side.


• The RPi is connected via Ethernet to Router2 on its LAN side.
  
  
  
  
  • The RPi's SSH port (22) is port-forwarded from Router2 as port 3333
    
    (so for example, from the laptop I use ssh pi@1.1.1.20 -p 3333)
  
  
  
  

 ------------

    Laptop   -  -  -  -  -

    2.2.2.100         

    ___________          |

    [____________]   

                           |



            /                  /                 /

  +----------------+  +----------------+   +----------------+

  |  Comcast       |  |  Router1       |   |  Router2       |

  |  Wi-Fi AP      |  |  Wi-Fi AP      |   |  Wi-Fi AP      |

  | LAN:1.1.1.1/24 |  | LAN:2.2.2.1/24 |   | LAN:3.3.3.1/24 |

  |                |  | WAN:1.1.1.10   |   | WAN:1.1.1.20   |

  +----------------+  +----------------+   +----------------+

      |   |                 |                  |  |

      |   +-----------------+------------------+  |

      |                                           |

      |                                           |

    Internet                                 +-----------+

                                             |  Rasp Pi  |

                                             | 3.3.3.100 |

                                             +-----------+

This is where I have the problem. SSH to the RPi using the
forwarded port does not seem to work from my laptop behind
Router1. If I move my laptop to connect directly to the
Comcast Router (where it has an IP address from the Comcast
router of 1.1.1.100), then everything works great.

Does Comcast simply not allow the connection due to it being
behind a router? I don't have any firewall rules set up that
block any of this traffic—I can only assume it's a routing
issue at the Comcast AP.

networking router routing

share|improve this question

edited 4 hours ago

Scott

16.2k113990

asked 5 hours ago

MidniteCommanderMidniteCommander

1

New contributor

MidniteCommander is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is router 1 set to allow all outbound traffic? I know it should be, by default, but maybe you have that turned off(?). With laptop behind R1, can you ping 3.3.3.1?
  
  – Larryc
  48 mins ago
  
  
  

  
  
  
  

add a comment | 

0

I am having some type of routing problem where I cannot
connect to a Raspberry pi via a port forward behind a Wi-Fi
router. I have a network set up consisting of a Comcast Wi-Fi
router (connected to the Internet). To extend my Wi-Fi range,
I have two additional routers, both connected to the Comcast
router via Ethernet. My network layout is below (excuse the
simple ASCII art).

• My laptop is connected via Wi-Fi to Router1 on its LAN side.


• The RPi is connected via Ethernet to Router2 on its LAN side.
  
  
  
  
  • The RPi's SSH port (22) is port-forwarded from Router2 as port 3333
    
    (so for example, from the laptop I use ssh pi@1.1.1.20 -p 3333)
  
  
  
  

 ------------

    Laptop   -  -  -  -  -

    2.2.2.100         

    ___________          |

    [____________]   

                           |



            /                  /                 /

  +----------------+  +----------------+   +----------------+

  |  Comcast       |  |  Router1       |   |  Router2       |

  |  Wi-Fi AP      |  |  Wi-Fi AP      |   |  Wi-Fi AP      |

  | LAN:1.1.1.1/24 |  | LAN:2.2.2.1/24 |   | LAN:3.3.3.1/24 |

  |                |  | WAN:1.1.1.10   |   | WAN:1.1.1.20   |

  +----------------+  +----------------+   +----------------+

      |   |                 |                  |  |

      |   +-----------------+------------------+  |

      |                                           |

      |                                           |

    Internet                                 +-----------+

                                             |  Rasp Pi  |

                                             | 3.3.3.100 |

                                             +-----------+

This is where I have the problem. SSH to the RPi using the
forwarded port does not seem to work from my laptop behind
Router1. If I move my laptop to connect directly to the
Comcast Router (where it has an IP address from the Comcast
router of 1.1.1.100), then everything works great.

Does Comcast simply not allow the connection due to it being
behind a router? I don't have any firewall rules set up that
block any of this traffic—I can only assume it's a routing
issue at the Comcast AP.

networking router routing

share|improve this question

edited 4 hours ago

Scott

16.2k113990

asked 5 hours ago

MidniteCommanderMidniteCommander

1

New contributor

MidniteCommander is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is router 1 set to allow all outbound traffic? I know it should be, by default, but maybe you have that turned off(?). With laptop behind R1, can you ping 3.3.3.1?
  
  – Larryc
  48 mins ago
  
  
  

  
  
  
  

add a comment | 

I am having some type of routing problem where I cannot
connect to a Raspberry pi via a port forward behind a Wi-Fi
router. I have a network set up consisting of a Comcast Wi-Fi
router (connected to the Internet). To extend my Wi-Fi range,
I have two additional routers, both connected to the Comcast
router via Ethernet. My network layout is below (excuse the
simple ASCII art).

• My laptop is connected via Wi-Fi to Router1 on its LAN side.


• The RPi is connected via Ethernet to Router2 on its LAN side.
  
  
  
  
  • The RPi's SSH port (22) is port-forwarded from Router2 as port 3333
    
    (so for example, from the laptop I use ssh pi@1.1.1.20 -p 3333)
  
  
  
  

 ------------

    Laptop   -  -  -  -  -

    2.2.2.100         

    ___________          |

    [____________]   

                           |



            /                  /                 /

  +----------------+  +----------------+   +----------------+

  |  Comcast       |  |  Router1       |   |  Router2       |

  |  Wi-Fi AP      |  |  Wi-Fi AP      |   |  Wi-Fi AP      |

  | LAN:1.1.1.1/24 |  | LAN:2.2.2.1/24 |   | LAN:3.3.3.1/24 |

  |                |  | WAN:1.1.1.10   |   | WAN:1.1.1.20   |

  +----------------+  +----------------+   +----------------+

      |   |                 |                  |  |

      |   +-----------------+------------------+  |

      |                                           |

      |                                           |

    Internet                                 +-----------+

                                             |  Rasp Pi  |

                                             | 3.3.3.100 |

                                             +-----------+

This is where I have the problem. SSH to the RPi using the
forwarded port does not seem to work from my laptop behind
Router1. If I move my laptop to connect directly to the
Comcast Router (where it has an IP address from the Comcast
router of 1.1.1.100), then everything works great.

Does Comcast simply not allow the connection due to it being
behind a router? I don't have any firewall rules set up that
block any of this traffic—I can only assume it's a routing
issue at the Comcast AP.

networking router routing

share|improve this question

edited 4 hours ago

Scott

16.2k113990

asked 5 hours ago

MidniteCommanderMidniteCommander

1

New contributor

MidniteCommander is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

 ------------

    Laptop   -  -  -  -  -

    2.2.2.100         

    ___________          |

    [____________]   

                           |



            /                  /                 /

  +----------------+  +----------------+   +----------------+

  |  Comcast       |  |  Router1       |   |  Router2       |

  |  Wi-Fi AP      |  |  Wi-Fi AP      |   |  Wi-Fi AP      |

  | LAN:1.1.1.1/24 |  | LAN:2.2.2.1/24 |   | LAN:3.3.3.1/24 |

  |                |  | WAN:1.1.1.10   |   | WAN:1.1.1.20   |

  +----------------+  +----------------+   +----------------+

      |   |                 |                  |  |

      |   +-----------------+------------------+  |

      |                                           |

      |                                           |

    Internet                                 +-----------+

                                             |  Rasp Pi  |

                                             | 3.3.3.100 |

                                             +-----------+

share|improve this question

edited 4 hours ago

Scott

16.2k113990

asked 5 hours ago

MidniteCommanderMidniteCommander

1

New contributor

MidniteCommander is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 4 hours ago

Scott

16.2k113990

asked 5 hours ago

MidniteCommanderMidniteCommander

1

New contributor

MidniteCommander is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 4 hours ago

Scott

16.2k113990

edited 4 hours ago

Scott

16.2k113990

asked 5 hours ago

MidniteCommanderMidniteCommander

1

New contributor

MidniteCommander is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 5 hours ago

MidniteCommanderMidniteCommander

1