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Today at my company we lost the Internet, and after checking the firewall (Sonicwall -- this is a nonprofit organization so they can't afford the best stuff), I discovered it was more than likely a DOS attack. Nobody could access the Internet, and I could not connect to the firewall because of the amount of data being sent on the network. What would be the best way to access the firewall, and what can I do to make sure this does not happen again?
Well, a dedicated modem connection is a common offline management method. The other obvious choice will be having somebody physically access and reboot the firewall. As for a reliable way to stop denial of services, there aren't any... Attack should be tracked and blocked in cooperation with your upstream Internet provider.