Buffalo router no Internet connection
First step in EVERY connection outage should be to bypass your router and connect your computer directly to your ISP device. Can you ping your DNS server? If the answer is no, try 188.8.131.52. If that still doesn't work, call your ISP. If it does work, then ping google.com, does it work now? If no, change your DNS servers and retest. If yes, your internet connection is fine and it is something with your router (since you have already ruled out a single computer).
Plug your router back in and log into it. Do you get an IP? Is your DNS set correctly? Try the above tests again from the router interface. Check your DHCP configuration. What do your computers get when they type ipconfig or ifconfig? Does that match what your router is set to hand out? Have you tried swapping cables between the router and the modem?
tcpdump can also be a friend here, especially if you can run it on the router's WAN (not sure if ddwrt is capable of this or not). It would be helpful to see what the router is actually sending out. I could also help to see what is being sent between the router and a computer.
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How to Connect to the Internet With a Router
A router is a networking device that allows your computer, or your network, to communicate with another network. In this case, the other network is the Internet. The router is also called the gateway because it provides an entrance to another network. Your router is likely to be a combination router/modem provided by your Internet service provider (ISP). To connect to the Internet, you connect your computer to the router/modem and then configure it in accordance with the instructions provided by your ISP.