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    Author Topic: Router/Modem  (Read 762 times)

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    Offlinesuperswag

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    Router/Modem
    « on: September 07, 2017, 10:38:53 PM »
    I forgot, do you need a router in able to port forward? or does a regular modem work?
    Runescape Gambling

    Offlinematzie

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    Re: Router/Modem
    « Reply #1 on: November 02, 2017, 06:11:00 PM »
    *Facepalm*
    Port forwarding is needed on a router because multiple devices can connect to the Internet through it.
    The router is the one with your Internet facing IP address. So when you get any network traffic, it first goes to the router.

    When you send an outbound request (TCP/IP), it creates a path to follow from your device, through the router, to your ISP, and eventually on to its destination. To receive a response to this, the network nodes along the way remember who you are and are capable of passing the requested information from the destination back to you.

    When you are connected to a router, you have a local IP address. This will be of the form 192.168.a.b or 10.10.a.b where a and b are values between 0 and 255 inclusively. Anyone connecting to you from the Internet facing side cannot see your local network IP.
    Just as you have a local network IP address that helps to identify you, your ISP also has an IP address that identifies your modem/endpoint.

    Your modem is acting as a network bridge, keeping traffic that was not designated for your IP from going any farther than the modem(after a while).

    Now put yourself in the situation where you have this
    [BOB DEVICE]---[BOB-NETWORK]---[BOB]---[BOB ISP]---[INTERNET]---[YOUR ISP]----[MODEM]---[ROUTER]---{DEVICE1,DEVICE2,DEVICE3}

    Say Bob wants to communicate with your DEVICE1.
    DEVICE1 has a local network IP, meaning it is of the form 192.168.a.b or 10.10.a.b.. Bob's network has a device of the same format. How do we get around this?
    This is where port forwarding comes in.
    In order for Bob to communicate with DEVICE1, he must figure out how to contact it.
    Remember, your modem has an IP address assigned by your ISP.

    This all boils down to one thing now.
    Bob can only get access to the IP address from your ISP.
    So bob sends a request to that IP address. If you only have a modem, there is likely a single device on the other side - so the decision of where it goes is known.

    If there was a router in the mix, then bobs request would end up at the router. At the router, the port forwarding tells the router, oooh - you wanted to talk to that device gotcha!
    smart phones are dumb
    people are smart phones.

     

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