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Solved
Dos Attacks
[DoS Attack: Land Attack] from source: 255.255.255.255, port 67, Saturday, September 12, 2015 15:58:56 [DoS Attack: Land Attack] from source: 255.255.255.255, port 67, Saturday, September 12, 2015 1...
Ok. Port 67, along with port 68, is used for DHCP. It's a little strange for the router to be complaining about DHCP unless somehow it's detecting a large burst of DHCP Requests in a short period of time.
According to your logs, the timestamps between "attacks" are several minutes to several hours apart, so it doesn't seem to be happening all that frequently and is probably not a real DoS attack. Perhaps you have an old device on your network that doesn't have a good DHCP Client implementation. If you are not seeing any performance or network issues, then I wouldn't worry about it.
Thank you for your reply. I'm not sure if I have it enabled. Will have to figure out how to check and how to disable it.