I already wrote a post at a german board and they told me that OpenWrt should be able to do the job.
My problem is a bit special I think. I do have internet about cable right now, but there are many downtimes and also packet loss happens quite often. I already terminate the contract, but it is still running till february next year.
Now I want to test normal DSL - this will probably be my choice in the future. So I need to connect two different ISP to my network.
This is the planned structure:
I already read that the Archer C5/C7 (flashed it form C5 to C7) should be capable to do this. If I need another device I am also up for that I guess. Already looked for a Loadbalancer to have both at the same time, but that is rather expensive.
What do I need to do to access "10"-LAN from "20"-LAN and the internet should be provided over the new modem?
I already searched the board, but I might have the wrong wording for it. Already found WAN failovers to other routers and so on, but I think this case is a bit different?
Thank you in advance!