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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.
Land Attack source 255.255.255.255 is caused by fragmented/ lost packets and not an actual attack via another computer. Im having the same issue , even going into the security section of the router keywords or closing the port 67 has no effect. I have not found any way to stop or find out more about this issue. I suspect it is a dns server problem provided by my ISP which is Charter Communications.