2 ISPs how to direct traffic

orangefork

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Dec 7, 2014
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I previosuly asked a similar question, but I understand now that I was complicating the issue by adding constraints to the possible solution, and by the way I was asking the question.

I have 2 ISPs and I would like to direct traffic.

A DSL modem/router that can be put in bridge mode.
A 3G USB Dongle that connects to an Asus RT-n16 with Tomato Shibby. This router cannot (as far as I know) receive the internet from the DSL modem in the WAN port because the WAN option in the firmware is being used by the USB Dongle.
An extra Asus RT-N16 router in case is necessary

1st group of devices must use only the 3G connection
2nd group of devices must use only the DSL connection

Both group of devices should be able to connect to each other.

How could this be done?
 
I use DD-WRT firmware and with that you can a Dual Wan router by converting one of the LAN port to a WAN port.
in addition, you can then use load balancing to use both connections at the same time or fallover where the second one takes over if the first one gets disconnected.

http://www.dd-wrt.com/wiki/index.php/Dual-WAN_for_simple_round-robin_load_equalization
http://www.dd-wrt.com/wiki/index.php/Dual_WAN_with_failover
http://www.dd-wrt.com/wiki/index.php/Dual_WAN_with_one_as_standby_backup
 


Do you know if this can be done with one of the connections being 3G with DD-WRT?