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Similar question and solution

I have LAN and WiFi connection, with the WiFi connected to internet and the LAN is simply connected via an Ethernet cable between two computers. I need to get Synergy working without compromising the WiFi internet. I've tried the solution above but couldn't seem to work. Both of the computer are running Windows XP.

Even setting the LAN IP to static and under the same subnet doesn't seem to work. Anyone with similar situation and got Synergy to work?

edit : Refined the question for clarity. Also, the computer are able to ping each other. Remote desktop can be accessed as well. I suspect the problem lies in Synergy's configuration.

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If you're not using a switch, then you need to look more at how you're connecting the computers, not how you're configuring synergy. Try a crossover cable (there would likely be more to it, but knowing which OS you are running on each computer would be useful to know for that). – MaQleod Jun 4 '11 at 17:08
Can you ping between the computers? If not, some things to check: 1: Ensure you are using a crossover cable. 2: Lock down the line speeds in the configuration - don't rely on auto-negotiation. 3: check your firewall settings - try disabling the firewall completely for a moment while you test the link. – Majenko Jun 4 '11 at 17:10

If I understand your question properly, you are looking to connect 2 computers together using an ethernet cable, and use that link to drive synergy. It will be important that your Wifi internet connection not be disrupted by the addition of this wired network.

If that is an accurate assessment of what you are looking to accomplish, then you would need to use a crossover cable to connect the 2 computers together. For the wired connection on each machine, you should assign a static IP that is in a different subnet than your wifi network. For example, if your Wifi network is on 192.168.X.X, then you should use 172.16.1.X for your wired network.

Once the wired network is configured, and you can ping between the 2 and your Wifi internet is still functional, then you should configure Synergy using the static IPs that you have assigned to the wired interfaces.

This should be Operating system agnostic.

There are a couple of drawbacks to this method however. The main one is that you will not be able to add an additional computer into the wired network without the additional of a switch. To be honest, you can pick up a used SOHO switch on-line for less than you will probably pay for the crossover cable at an electronic store.

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Add the /32 address(es) of the other machine(s) to the routing table via the wired interface.

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Are your IP addresses in the same range (IE ethernet range is in 192.168.1.x and so is wireless) if so the wireless (and its gateway) might be "stealing" the traffic and not knowing how to get it back. To avoid this I would suggest running synergy on its own separate range. If your home network is 192.168.1.x let your wireless grab one of those, give the ethernet connections a manual address. Something in a different range like 2.x

Try pinging between the machines with the 2.x address to check connectivity. Then make sure you have the Client (computer with no keyboard/mouse) configured to use the server's 2.x address enter image description here

A sample (redacted) config from my setup is here

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I wanted to do the same as the Synergy client mouse movement was lagging and ethernet is a faster connection than wifi as it is.

I did it on my iMac and Macbook Pro by simply connecting them via an ethernet cable and then on the Synergy client I entered the IP address being used by the ethernet on the server computer. If using a mac you should see it under the network preferences. I am not aware how intuitive the corresponding Windows XP configuration is, as I don't deal with Windows as much as i used to.

As much as I can tell try just connecting both computers and check the ip address of the ethernet connection on the server computer and enter that in the server IP field of the latest version of Synergy and it should work.

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