Half a year tormented the familiar sysadmin with the question of combining two channels into the Internet. He was going to build a Linux server for this. Then I experimented with Asus 500 - there you can also configure Linux and start the services. In general, the canoe lasted a long time: (While I myself did not use the Internet to vent the issue.
And now: DI-LB604 Express EtherNetwork 4-port router with load balancing function and 2 WAN ports. ')
I hasten to share with you joy. For 3000 re you will have a great device that will help: - merge two channels into intrnet - balances the load on the channels - in case of a fall of one of the channels, it automatically redistributes the load (i.e., the channels are reserved for each other)
Read about its other features on the manufacturer's website: www.dlink.ru DI-LB604 .