prioritize Internet connection over wifi and lan both

I have ethernet LAN in my office which is connected to the router and internet access on all PCs is through the ethernet LAN.

However there are times when internet connectivity is down. In such times, the LAN networks works fine.

I want to install a 3G modem so that when the internet connectivity is down, the PC's will wirelessly connect to the 3G modem and access internet through 3G but LAN through wired network.

I tried this but the internet traffic still goes through the ethernet network with no internet connectivity.

Please help
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  1. I tried this but the internet traffic still goes through the ethernet network with no internet connectivity. Doesn't make sense.

    3G modem sends internet to the router. the router connections to the PCs stays the same. If you get slow down with heavy traffic you can improve with faster internet and faster modem and router. Are you using ADSL2+ or Fibre Optic? Is your modem/router N600 or above? How many PC's do you have connected?
  2. The simplest way to do this is to use a dual wan router. Many of the asus and tplink routers have this ability. They can use the 3g as a backup. You of course can do this on your PC also but it is better in a office with many users to put in on a router.

    The huge issue is how do you detect the internet went down. If you have a person detect it is pretty easy for force the traffic over either by logging into the router if you did it that way or modifying the routes with the route command if you are using a PC.

    Automated tools are tough nothing actually goes down. Its not like the modem turns it self off if it loses connectivity to the ISP. Even worse say the ISP is actually up but it loses one of its connection to its upstream partner so now only part of the internet is down and part is up.

    This is the exact reason large companies use routing protocols so they can detect outages. They are constantly sending messages to the ISP router and if these stop or the ISP tells them something is down they can take a action.

    The only automated things I have seen recommended for consumer grade equipment was to run scripts that run ping commands to something on the internet. If the ping fails too much they issue command to change the path. I am not sure if the asus and the tplink have that yet I know the ddwrt loads for the router you can do that.
  3. Apologies for the late response.

    I have 10 laptops on the network. All are on wifi network. I am cabling my office now to get better speed for local network. The ethernet and wifi are on the same router.

    Problem 1 when someone unplugs their laptop from ethernet they do not get internet connectivity over wifi.
    Problem 2 when my internet connectivity is down, I switch on tethering on my mobile and get connected to Internet. I want to be connected to LAN on ethernet network and also on wifi for my internet usage. I want this to happen without making any setting changes on the laptop so that anyone of the staff can do this for their laptop and mobile.

    My office is a fairly new startup so I am relying on consumer grade products as can't afford the Cisco stuff..

    Hope this is clear now.
  4. I do not even know where to start on this one, redundancy is actually a very advanced network topic.

    The problem is the automation. Pretend you are the computer. How do you as a person figure out the internet is actually down and it is not just some web site being slow or your pc acting up. How would you ever get a simple program that could do this.

    You are pretty much stuck with a person figures out there is a problem and forces the router or pc to switch over or you spend lots of money for someone to program a automated system. It is surprising you can even get a consumer router that can do very basic redundancy.
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