My ISP supplied a router, which has very basic functionality. I did not get any username/password with it, so I assume that I can only use that particular router to access the internet.
So currently my network is as follows:
http://chaos.stw-bonn.de/users/mu/uploads/2014-03-19/1.png
I am thinking about buying a decent router where I could use openWRT for instance and set it up like so:
http://chaos.stw-bonn.de/users/mu/uploads/2014-03-19/2.png
What I expect from it would be:
See internet usage: My plan is unlimited, and the ISP does not track the usage. So I have no idea how much I use, and it interests me a little bit.
Having a decent router with a hopefully decent firewall. The cheap ISP routers are known to have little security and my one cannot be configured properly.
USB port on the router for file sharing within the network without needing a dedicated PC for this.
Second wifi which is separate from the internal one. That way, I can give internet access to guests without letting them into my private network.
Can a second router work behind the ISP router which currently gives IP addresses via DHCP?
Answer
Yes, people do this all the time. :) It's extra handy when you're trying to segment a 'guest' network that's firewalled from you, as it looks like you intend to do.
Otherwise to your points, you'll just want to shop around to find the features you're looking for. Perhaps use and old PC and look into using a solution like Untagnle.com's products.
Also look into alternative router firmwares like DD-WRT.
As for DHCP:
Set the WAN of the internal router to use DHCP from the ISP's router to get its WAN/"Internet" settings. Then use the internal router's DHCP server to serve DHCP for the internal network, on a different subnet.
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