For what can I use this "Ethernet Network Splitter"?

[Eldin]

I bought this Ethernet Network Splitter almost a year ago because I needed to connect 2 devices to 1 Ethernet port on a router.
That failed to work.

https://steamcommunity.com/sharedfiles/filedetails/?id=2154931376
https://steamcommunity.com/sharedfiles/filedetails/?id=2154932288

I can't figure out for what is this "Splitter" used for.

These are the things I tried:

• Plug in the male end into a router.
  Then I plug in 1 device into female end (internet works)
  As soon I plug in 2nd device into female end internet on both devices stops working (they show that network cable is not connected)
  
• Plug in male end into PC
  Then I plug in Ethernet cable from a router into female end (internet works)
  Then I plug in another Ethernet cable from another router into 2nd female port on andapter. (On PC it shows Network cable disconnected)

To recap it:
If I connect 1 Ethernet cable to any of the 2 female ports, interrent works
https://steamcommunity.com/sharedfiles/filedetails/?id=2154945680
But if I connect 2 Ethernet cables to both female ports, internet doesn't work
https://steamcommunity.com/sharedfiles/filedetails/?id=2154956904


So, how exactly do I use this Ethernet Network Splitter?

[Bad 💀 Motha]

https://youtu.be/SZLh2OHyOeM

[Eldin]

So basically 1 splitter is useless.

And I've been already doing what's done in that video, but via the old-school way (by cutting the cables and rewiring them)
https://steamcommunity.com/sharedfiles/filedetails/?id=2154974613

[Omega]

Basically what it does is it has 2 inputs which can both talk at half speed. The two ports on the plug can not talk to eachother unless the device the splitter is connected to works as a switch and routs the data.

So you could connect it to your router and then have 2 computers make use of a single port on the router, albeit at half speed. Or you could connect it to your PC and make your PC have access to both your home network and a "secret" seperate network/device which is not connected to the network itself.

If you want to make a device connected to one of the female ports to be able to talk to the other female port while the device is connected to your PC you will have to configure your PC to work as a switch.


Just buy an unmanaged switch. Then you can just connect all your stuff and it will work.

[Bad 💀 Motha]

Just connect devices via their own Ethernet cables, CAT5E or CAT6A are what to look for.

If your Isp all in one modem+router or your own router lacks enough ports, buy an Ethernet Switch as a means to expand your Routers ports for more wired devices.

Do not buy a Ethernet Hub
A switch is basically a hub, but on an Ethernet switch, all the ports can all be actively used all at the same time, and while all working at full speed your router and Isp allows for. A hub will lose speed the more ports you actively use.

[Eldin]

Omega původně napsal:

So you could connect it to your router and then have 2 computers make use of a single port on the router, albeit at half speed.

Before I bought any routers I had a problem where I had to connect PC and Raspberry Pi via Ethernet but only 1 port was available on ISP's modem (their modem can act as both modem and router) so their IT guy told me to buy this Splitter and then connect it to the modem and connect PC and Raspberry to the splitter.

I tried that and it doesn't work.

Omega původně napsal:

Or you could connect it to your PC and make your PC have access to both your home network and a "secret" seperate network/device which is not connected to the network itself.

Now I bought 2 routers and I'm trying to do something else with this Splitter.

This is the current Scheme of my Network (cousin gave me permission to use his wifi)
https://drive.google.com/file/d/1QklQH5HxyhPO0b1TDvG-Nr-1hUg6cyF7/view?usp=drivesdk

I connected both connections to my PC by connecting one via Ethernet port on my PC and another by using USB to Ethernet adapter.
It works flawlessly and it doubles my internet speed.

Now, what I'm trying to do with this Ethernet Splitter is to plug it in into Raspberry Pi running OpenWrt and have both mine and cousin's connections plugged into it (Ethernet cable from the Asus to Raspberry and from Tenda to that same Raspberry)
And then I would share combined connection via Raspberry's WiFi.

[KeplersConjecture]

Just buy a switch, this is exactly what they are made for.

[_I_]

^ this

a 5 port gigabit switch is around $10-20
i have a few that are usb powered

[Bad 💀 Motha]

You can get an 8 port Ethernet 1gbps Switch rather cheap on Amazon or Ebay. Such as Netgear, D-Link, TP-Link

[Eldin]

I never used switch before so I don't know where to connect it.
If I understood correctly, when I connect multiple devices to switch they'll be able to see each other and all packets will go where they should?
Do I connect Asus and Tenda routers and OpenWrt raspberry Pi to switch via Ethernet?

So when I for example open a webpage on My PC it should go like this?
PCAsusSwitchOpenWrt Raspberry.
Then OpenWrt Raspberry asks PiHole Raspberry for IP address (OpenWrtSwitchAsusPiHoleAsusSwitchOpenWrt)
Then OpenWrt Raspberry does the network bonding thing by accessing internet through both Asus and Tenda routers, get responses back, combine them and sends them to SwitchAsusPC

Is this how it would work?

[Eldin]

This is to illustrate what I meant in post above[i.postimg.cc]

And also, if I understood this would be the best way to connect stuff[i.postimg.cc] if I could physically connect them like this of course?

[KeplersConjecture]

Eldin původně napsal:

This is to illustrate what I meant in post above[i.postimg.cc]

And also, if I understood this would be the best way to connect stuff[i.postimg.cc] if I could physically connect them like this of course?

The second layout you have is probably the best one for your topology. Plug your switch into the router and all of your endpoint devices to the switch.

If I understood correctly, when I connect multiple devices to switch they'll be able to see each other and all packets will go where they should?

Yes all the endpoint devices on the network should be able to see each other, as long as you dont have any physical or logical network segments. If you do then the traffic needs to go over a router (or a layer3 switch), but for your topology you should be fine.

[iceman1980]

Ethernet splitters cannot be used to connect two devices to the one Ethernet cable with bidirectional communication. You can only use half-duplex devices on an ethernet splitter. It is better to use a layer-2 switch which can do bidirectional full duplex communication between devices.

Switches are able to maintain a MAC table get a switch not an ethernet splitter. Also known as a CAM or Content Address Table this keeps track of learned MAC addresses on the local network segment. Ethernet splitters are slow very slow.

[Eldin]

Will one of these do the trick?
https://www.gearbest.com/modems/pp_009750839834.html
https://www.gearbest.com/modems/pp_009852032086.html

There are 5 ports.
So I just plug in 2 routers, 2 raspberrys and PC and it will work?

And how will devices see each other?
Can someone answer questions from this picture?
https://i.postimg.cc/1sJMNWyn/IP-adresses-and-stuff.png

Which IP addresses would these devices have?
And how would I access FTP server from my phone and PC?

[iceman1980]

Eldin původně napsal:

Will one of these do the trick?
https://www.gearbest.com/modems/pp_009750839834.html
https://www.gearbest.com/modems/pp_009852032086.html

There are 5 ports.
So I just plug in 2 routers, 2 raspberrys and PC and it will work?

And how will devices see each other?
Can someone answer questions from this picture?
https://i.postimg.cc/1sJMNWyn/IP-adresses-and-stuff.png

Which IP addresses would these devices have?
And how would I access FTP server from my phone and PC?

In order for your two different network segments to communicate you'll need vlans. With intervlan
routing; a switch is a layer-2 only device. What switch do you have? You would need a router between your two different network segments

As
192.168.50.0 /24
and
192.168.0.101 /24 are in completely separate segments that can't communication without a router or layer-3 switch between them.

[Omega]

Eldin původně napsal:

Will one of these do the trick?
https://www.gearbest.com/modems/pp_009750839834.html
https://www.gearbest.com/modems/pp_009852032086.html

There are 5 ports.
So I just plug in 2 routers, 2 raspberrys and PC and it will work?

And how will devices see each other?
Can someone answer questions from this picture?
https://i.postimg.cc/1sJMNWyn/IP-adresses-and-stuff.png

Which IP addresses would these devices have?
And how would I access FTP server from my phone and PC?

Make sure you are buying a Gigabit switch and not a Megabit one. That $10 switch will likely not go any faster then 100Mbit.

Switches are very simple devices, all they do is keep track of the MAC addresses of devices. All the switch knows is that MAC AA:BB:CC:EE:FF:12:34:56 is somewhere behind ethernet port 2. So when there is traffic addressed to this device it will send it over that port.

There are some exceptions to this, some switches will look at IP but those devices are rare in a home network and not worth going in-depth on.

Managed switches have an IP address, unmanaged ones do not.

Disable DHCP and DNS on the router you are using as an access point. It should get it's IP from the Asus router or your Pi Hole. Just make it all one single network. I doubt you are running a /16 subnet, with a /24 subnet those devices will not be able to communicate with eachother as-if they are on the same network without work-arounds.