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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?
agree with @techie007; most decent new routers are multi-band, and have a "guest" function for isolation (as in your design). The nice thing about having that all in one router is to avoid maintaining/logging in multiple routers. So disable wireless on the ISP router and just use the wired connection to your new router. – jdh – 2014-03-19T13:02:51.363