And when your internet breaks down…

… you start connecting that console link again and start typing to get that other internet connection to work.

In this post I explained I had made a network of 3 routers so that my web-/database-/whatnot-server was able to serve over

2 different external IP’s via 2 different ISP’s (one broadband, one dsl). It had a hickup however in that the 2nd ISP couldn’t be used for normal Internet surfing etc. This was because it has a NAT configuration upside down to avoid the default-router issue.

So now I have connected a 4th router to do normal routing between the internal 192.168.0.0 network and the other network 192.168.2.0 to get to the router that connects to the dsl isp (still following?)

It proved to be quite simple (feel a bit silly to use the router for such easy work). It just routes to and from both network interfaces, with the

exception that it blocks all traffic to and from the server (because that one should use the other router with the upside down NAT configuration).

And then it just works. (well, you need to manually set the gateway of your client ofc.) I could probably make the server be able to connect to the other isp as well as long as I make sure the proper ports are blocked… But that’s stuff for at a later time.