Can I connect the modem to the switch then to the …

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    You can, but the switch will be of no actual use in this case.

    Your scenario:

    If you use a modem, you get a public IP on a device connected to it. If you’re on residential internet, your ISP only allows you to a single public IP per connection. So, in case you put a switch behind a modem, the all devices connected to the switch will get a public IP (or only a single device may get an IP, all others may revert to no connection status, depending on your ISP). In such a case only a single device will be able to access the Internet, all other devices will just fail to authenticate with the ISP’s server.

    HOWEVER:

    If the switch is behind a router (which in most cases uses NAT), all devices connected to either the switch or the router can access the internet simultaneously.

    Putting a switch between a modem and router is just as equal to not putting it: a switch won’t be of any use in your case.

    Simple Rule:

    MODEM → ROUTER → SWITCH/ACCESS POINTS → MULTIPLE CLIENTS

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    Not in any way that will do what you want — unless your modem is also a router.

    The normal way to hook these up is Modem – Router – Switch. In this configuration, your router should have a WAN port (sometimes labeled with a globe) and multiple LAN ports, sometimes labeled with numbers. Hooking one of the LAN ports on the router to ANY port on the switch is the correct way to add wired ports to your network. The single port on the modem is hooked to the WAN port on the router.

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    You can, but it won’t do what you want. You need a router connected to your modem because it allows many devices to be connected to the modem. When you add a device to a router, the router assigns a LAN IP address, The router takes care of translating between the WAN and LAN addresses. A switch can’t do that. So do what Scott King Walker said. Connect the modem to the router’s WAN port. If you want more LAN ports than are on the router, connect a switch to one of the router LAN ports.

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    You can… but for most people, it would be pointless. If your ISP isn’t giving you more than one static IP, then you’re wasting money.

    Mind you, I do have a switch between my modem and routers at nearly all of my businesses, but we’re running fiberoptic and one location as about 15 IP addresses; I think the location with the fewest is running 5.

    Some devices, like our guest WiFi, use two IP addresses. While I do try to run most of my systems over a single IP, there are situations where I want (or am required to) run my systems isolated from one another. In fact, I run two separate service providers at each of my locations, as my fiberoptic provider once lost the line into the county 3 times in one year (which resulted in many businesses and banks shutting down for the several days it took to get it back up). While my secondary is quite slow, it allowed me to keep my front desk operating and making reservations, and collecting payment by credit card. A Dual WAN router set in Failover mode will automatically and seamlessly switch connections; I even have a cellular modem I can plug into the router that will keep me going when the county lost power and we were running on generators.

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    It depends on your connection. If your modem is also a router, then the devices connected to your switch will be provided their DHCP information, and all connectivity by the modem. The router will also get it’s address from the modem. And the router will basically be doing nothing.

    But let’s say you want an internal and external network. Then this could make some sense. You put the devices you want to really protect behind the router, perhaps with a second switch, and the devices you want to protect them from on the switch outside the router. Now you’ve got some devices that have Internet access, but can’t reach the internal resources, while others can do both.

    But the best way is

    Modem

    Router

    Switch

    And you’ll lead a happy life.

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    Q: Can I connect a modem to a router then to a switch?

    A: Yes you can connect a modem to a router then to a switch.

    • That is an old fashioned way of doing it but it still works
    • Today most ISPs will give you a modem that has a built in router and a built in WiFi Access point
    • That means that on these new devices you don’t need anything extra
    • These new devices will typically be able to handle up to 254 devices in your network, so no matter how many desktop computers, laptops, smartphones, tablets and watches you have, the all in one modem will be able to handle all your needs

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    Yes you can. but if the router has enough ports already its not necessary.

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    Exactly what I have done at home:

    Telephone line into DSL Modem (Netgear)

    Modem via Ethernet cable into Router (Asus)

    This links to a smart TV & an 8 port Switch upstairs

    The Switch connects to about 7 extra devices, a 2nd WiFi hotspot, 2 PC’s a game console, and a little PC Server and NAS Device (these are actually a 2nd 4 port Switched Hub)

    Including WiFi devices my “little” home LAN hits nearly 20 devices in total…. No way you can have that many devices without a Switch. Using WiFi alone wouldn’t be practical.

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    Yes, that will likely work but I’m not sure why you would do that.

    If the modem is for residential use it’s likely to work only when connected to a single router. Having any other device connected to the switch would do no good, as it would be ignored by the modem.

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