I have a portable mini wireless router with different functions (AP/Client/Router).
Can I use a ethernet splitter to give internet access to two devices? The router only has a ethernet port and connects to a wireless network (Cliente mode).
I know that a switch would be the best option but I dont have one and they are expensive.
No.
A star shared regular Ethernet network can not be split by just tying cable together. If you want to connect two devices simultaneously to the same cable then you ether need a hub or a switch.
The device you are showing in your post is either one of these two:
The explain these a bit more:
Plain old 10/100 Mbit Ethernet has a standard cable with 8 wires, 4 of which are used. If you creatively rewire a few of these and (un)rewire those at the other end you can use two fully independent connections of the single cable.
Note that this just act as two cables in a single cable package and that you still need something to get the devices to talk to each other.
No, for two reasons.
The Ethernet splitter just allows two Ethernet links to run over a single cable. You don't have two Ethernet links, so the splitter doesn't help you.
But also, you can't build out from a client connection. When you make a client connection to an access point, you only have one hardware address. The access point (which is what your router is acting as) will register the first hardware address it sees as the other end of the client connection, and the other device won't work. The WiFi specification requires this behavior of the access point you are connecting to. So a switch won't help you either, sorry.
You could get another mini router. You could get a wireless router that is specifically designed to bridge multiple devices to a client connection. You could connect some device that supports Internet sharing to the mini router and connect the other device to it.
No. In order to split an ethernet port, you need a splitter on the other end. This guide provide the details on how to create an ethernet splitter. You will see the "other end" require a splitter as well. In your case, your ap/router would need two ethernet jacks to accommodate both connections. You need a hub or switch any way to properly expand your one jack. You can buy a 5-port 10/100 Mbps Netgear switch for $10 with shipping on eBay.
