Setting up 2 internet connections, 2 routers - same network - help please

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ozajm

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Jul 12, 2015
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Hi all,

I'm hoping to draw on your combined knowledge to help me with my slightly strange setup. Networking is a bit baffling to me but what I want to do is the following.

I have a local network currently with one router and multiple switches. That router has my broadband connection. However that internet connection is quite slow and I need to be able to access applications remotely on one particular computer through a faster connection. I have therefore bought a 4g/lte router that I want to use for remotely accessing the computer. The problem is I still need that computer to be connected to the local network so the same application can be accessed through the LAN (as opposed to over the 4g/lte connection) in the same location.

Any ideas on what settings I need to modify on the routers to pull this off. It's also very important that the 4g/lte connection is only used for the remote access as the data is quite expensive to use for normal browsing.

Greatly appreciate any help!

Thanks,
Ajay

 
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There are a couple of options but assume you connect both routers to your lan assuming you main on is on 192.168.1.1 then assign your 4g device to 192.168.1.2 making sure the DHCP is turned off.

Now the hard part. You must tell your pc to use 192.168.1.2 for any sites you want to access via the broadband. This can be done with the ROUTE ADD cmd. You would do ROUTE ADD x.x.x.x mask 255.255.255.255 192.168.1.2

Getting the list of x.x.x.x addresses is the hard part if the list is large.

There are dual wan routers that can do a similar function but you still have to put in lists of ip you want to use the secondary connection. Things like dd-wrt have some abilities to script which connection use which but it really depends on your...
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bill001g

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Aug 9, 2012
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There are a couple of options but assume you connect both routers to your lan assuming you main on is on 192.168.1.1 then assign your 4g device to 192.168.1.2 making sure the DHCP is turned off.

Now the hard part. You must tell your pc to use 192.168.1.2 for any sites you want to access via the broadband. This can be done with the ROUTE ADD cmd. You would do ROUTE ADD x.x.x.x mask 255.255.255.255 192.168.1.2

Getting the list of x.x.x.x addresses is the hard part if the list is large.

There are dual wan routers that can do a similar function but you still have to put in lists of ip you want to use the secondary connection. Things like dd-wrt have some abilities to script which connection use which but it really depends on your requirements.

 
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Solution
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ozajm

Reputable
Jul 12, 2015
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4,510
Thank you very much for that. However in this case I am accessing an application that resides on the computer from different locations (and hence ip addresses). It would be almost impossible to list all the ip addresses that may be accessing the computer. Is there any other way to do it? I am happy to route all wan traffic on that computer through the lte router as long as the computer can still be accessed locally by other computers on the LAN connected to the other modem/router.

Thanks again!
 
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bill001g

Titan
Aug 9, 2012
28,318
2,754
125,640
You could do the reverse then. Still leaving the dhcp off on the 192.168.1.2 router. You would then assign a static IP and gateway to this special computer....likely you would have to run static anyway for the port mapping to work.....(a note on this later that I just thought of) You would set the default gateway to 192.168.1.2

This would make this computer always use the broadband connection for everything. You could then use the route command to send other traffic that you know goes to web sites manually to the 192.168.1.1. This list could be as long as you like you would for example run youtube and netflix out the main connection and let the rest default to the mobile broadband.

Now my concern.

Having done similar for a number of people on extremely slow internet connection there seems to be a common issue. Most mobile broadband ISP do not give you a routable ip address. Most are running NAT someplace in their cloud. This means you can never access stuff remotely over these systems because the port mapping would need to be done in the ISP router you have no access to.

Maybe you get lucky and you have a real ip. I know verizon charges extra to have a routable IP.

You do get a routable IPv6 address from most but that does little good since most other people do not have IPv6 support.
 
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