Using two router/ a router and a repeater as "Wireless Ethernet Cable"

dovdevan05 · May 7, 2015

Hi,

So I have two components with Ethernet connections, I cannot run a cable between the two so I'm looking for a wireless solution.

Is there a way to set up two routers or one router and one repeater or AP to function as an Ethernet cable? just transferring the packets?

Thanks for the Help,
Ohad.

bill001g · May 7, 2015

The actual function you want is called client-bridge. They make devices that do just that function but many of the repeaters/extenders you find on the market have that ability also. A router or a AP generally does not have that feature but some do you would have to search the feature. You most times have to load third party firmware on most routers to get that ability since it is not a feature from large manufactures.

It really depends what your needs are and how many devices you plan to hook behind the remote device. It gets very complex pretty quickly. The key thing you want to avoid unless you need the feature is to have the remote device retransmit a wireless signal. That is a wireless repeater and it degrade the original signal a lot. Hard to say the terms repeater/extender are used very inconstantly by vendors. The things you want to look for at client-bridge and maybe WDS since that feature is required to allow multiple devices to be behind the remote device.

dovdevan05 · May 10, 2015

First, thanks for answering.

I'll try to explain my application a little. I'm using two components who use Ethernet to communicate (e.g a PLC and a remote IO unit). For some physical reason I cannot run a cable between the two and that's why I'm looking at wireless solutions.

The PLC needs to know what is the state of the IOs at very small intervals.

I thought that connecting the PLC to a router who has a wifi set up on one end, and the IO unit to an extender ( Or any other unit) on the other end and use the wifi between the two to transfer the data between the PLC and IO.

bill001g · May 10, 2015

As long as they use eithernet protocols to talk it will work. Ethernet is a data encoding method not just some form of cable. Using a router and a bridge will allow you to pass ethernet frames between the units. It will not though pass other forms of data.

For example 2 cat5 cables are used by some special devices to pass HDMI video/audio signals longer distances. Since this is not using ethernet you can not hook it to a router or other ethernet device.

dovdevan05 · May 10, 2015

The protocol will be MODBUS TCP

I understand that there is a custom firmware by DD-WRT. Will I have to flash it on my repeaters or is client bridge a capability repeaters have out of box?

bill001g · May 10, 2015

You can use DD-wrt on a router to make it into a client-bridge if you like. They make a lot of client bridge devices out of the box. Engenious and ubiquiti are 2 I have used many times...mostly outdoor ones. Dlink and linksys make devices also but I have not used them.

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Using two router/ a router and a repeater as "Wireless Ethernet Cable"

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