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networking - Multiple internet connections being used.


Say, on my computer I happen to have three internet sources.




  1. USB tether from my phone




  2. WiFi to my home network




  3. Ethernet to another router different from my wifi.




I want to use 1 to brows the web. 2 to transfer files to another machine in the house and 3 to transfers other files to other machines.


The above is an overly exaggerated use case. Most likely option 3 wont exist.


Is this possible?


How?



Answer



(you don't say what OS so I am assuming windows for this, other OS's have similar commands)


This can easily be set up via the route command in windows.


route [-f] [-p] [Command [Destination] [mask Netmask] [Gateway] [metric Metric]] [if Interface]]

You would need to set up 3 routes



  1. Default connection that uses the USB Teather

  2. A route for a single computer to use the WiFi

  3. A route for the rest of the local connections


Assumes:



  • 192.168.0.1 is the IP of the gateway on the tether

  • The interface ID of the WiFi is 11

  • 192.168.1.3 is the IP of the "other computer".

  • The interface ID of the Ethernet is 12

  • The subnet of the Ethernet is 192.168.2.0 with a netmask of 255.255.255.0


Adding the default gateway (also -f clears out any old routes already set up)


route -f -p ADD  0.0.0.0 mask 0.0.0.0 192.168.0.1

Add the route for the "other comptuer" that is connected via WiFi (as long as the subnet is different than network 3 you could just use the same command as the 3rd command for the 192.168.1.0 subnet if you wanted every computer on your home network to work instead of just one or adding them individually)


route -p ADD 192.168.1.3 if 11

Add the route so the rest of the computers in the 192.168.2.x range are all via the wired Ethernet


route -p ADD 192.168.2.0 mask 255.255.255.0 if 12

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