Can I split a modem into two ethernet connections? (+ more questions)

[Kawaii Penguin]

Hi.
I am planning to make a new set up that would help out me and my mother.
I'm planning to get this new modem .
It should provide internet speeds up to 960mbps.

From there, I'm going to attach a splitter to the 1 ethernet port, and split it between a router and my powerline adapter, so that I will still get 'direct' connection to the modem, and my mum will be able to connect wirelessly through the router. The router hits speeds up to 300mbps, which is around 100mbps less than the amount we pay for, butttt.. you know, me being me, I think I'll need to use the computer far more often. Fair trade?

Here's the router.

This is the splitter I plan on using, as well.

And of course, here's the design I'm going for.
https://gyazo.com/e78f7b6e4bbd42845b0f4211e2bd35f1

My question is: Will all of this work? What would be some negatives to doing this?

 

[Blatcher2]

Plug your power line into a port on the router and have just one cable going from the router to the modem.

 

[Solandri]

99% of the time, no you can't. Cable and DSL modems will usually lock onto the first device which connects to their ethernet port, and communicate with only that device. (This means that with most modems, you need to power cycle them if you change the device that's plugged in.) The reason for this is that the device connected to your modem is connected directly to the Internet. 99% of the time your ISP only gives you a single Internet-facing IP address. So it gets assigned to the first device which you plug into the modem.

The device you want plugged into the modem is the router. Plug the router into the modem, then plug your powerline adapter into the router. The router acts as a splitter (switch), and a firewall protecting the devices on your LAN from direct exposure to the Internet. It also manages your LAN, assigning local IP addresses via DHCP, port forwarding where appropriate, etc. If the router degrades your Internet performance, you need to get a better router.

The 1% of the time is if you purchase multiple IP addresses from your ISP. Many businesses do this if they want different IP addresses for different network functions (e.g. web server, VPN, mail server). In this case, the modem will be a higher-end model which can assign a specific Internet-facing IP address to a specific device that's connected. Usually they come with multiple network ports to allow you to connect your multiple devices, obviating the need for a switch.

 

[Alabalcho]

This is not going to work. You connect modem directly to WAN port of the router, and everything else connects there. Your "tower" connects to router' LAN port. With 400mb Internet connection, you don't have to worry about your mom' phone pulling 20mbps YouTube videos.

And if you have read your "splitter" description:

NOTE: This Ethernet splitter allows two computers to share one Ethernet line ONE AT A TIME, but it doesn't support 2 computers that connect to the internet simultaneously, ONLY 1 output port is working.

 

[Snipergod87]

Hi.
I am planning to make a new set up that would help out me and my mother.
I'm planning to get this new modem .
It should provide internet speeds up to 960mbps.

From there, I'm going to attach a splitter to the 1 ethernet port, and split it between a router and my powerline adapter, so that I will still get 'direct' connection to the modem, and my mum will be able to connect wirelessly through the router. The router hits speeds up to 300mbps, which is around 100mbps less than the amount we pay for, butttt.. you know, me being me, I think I'll need to use the computer far more often. Fair trade?

Here's the router.

This is the splitter I plan on using, as well.

And of course, here's the design I'm going for.
https://gyazo.com/e78f7b6e4bbd42845b0f4211e2bd35f1

My question is: Will all of this work? What would be some negatives to doing this?

Wont work at all, everything needs to go through your router, and those RJ-45 splitters are not for network traffic.

 

[13thmonkey]

why is no one suggesting a simple 5 port switch? This is just a problem of creating a simple network or have I missed something?

 

[Snipergod87]

13th you cant put a switch right behind a Modem on a home internet connection. You are only given 1 WAN address, so only 1 of the devices would lease an IP from the ISP and the other would get no access. Since he already had a Wifi router which will have ethernet ports he wouldn't need a new switch, just plug into that.

You need this kind of setup.
https://imgur.com/a/SpRihHa

However Kawaii Pengiun, if your internet connection is faster than 100Mbit then you will need a new router, its WAN and LAN ports are only 10/100.

 

[13thmonkey]

Agree, oddly my router at home has 1 port so we could be in a similar position.

As you know it must be modem > router > computers and many computers can sit behind the router.

OP I'm going to have to assume that you aren't 100% familar with how things work. There is no benefit to trying to get two connections, partly because it won't work, and it won't help with speeds. People will only get the speed that they are using at that moment in time. A 5 port switch will resolve issues of not having enough connections on the router, but it must be modem > router > PC's either wired or wireless the router will deal with making sure everyone gets the best connection that they can at that moment in time, it does not simply give 1/2 to one and 1/2 to another.

 

[failboat]

What internet plan are you paying for? Are you just looking at the modems potential speeds? You want your modem to be oversized quite a bit, but it doesn't mean the ISP will not limit you to what your plan is for.

Also 300Mbs on wireless is fairly outdated. You want 2x2 mimo AC to hit over 200Mbs. 4x4 mimo AC can get closer to 400-500Mbs. The listed speeds for wifi aren't realistic 50% or less assuming your device can make the best connection. Most newer high end devices only have 2x2 mimo. Some laptops have better. Only a few phones have better.

Just wire into one of the free ports on the router. Make sure it's 1Gbs. If it's not buy a newer router.

 

[Kawaii Penguin]

Thank you guys for all the info. This helped me out a lot.
We've stuck with the modem/router hybrid that our cable company gave us for quite some time now, so having two separate devices that does the same thing is foreign to me.. even though I've been familiar with computers for over a decade now.
I think I learned the most information off of Solandri, so I'll let him have the answer for this one.
Cheers.