Do you really get 20mb once tested or you are taking your ISP word's for a fact ? because if the latter is true, then the number can be pretty inaccurate, please do perform a speed test using one of the online tools available for free.


20mb for 77 miners is more than enough , provided that 20mb is the actual bandwidth you getting and the ping to the pool is not too high.


Please use the code function to post such data , I can't tell for sure if your network log has anything abnormal about it, but you seem to have a bit more than just mining going on, while this is not a 100% proof of your network being compromised as some of those connections might be coming from a PC update or you connecting a mobile phone to the router or any other cause.

but to really eliminate the possibility of your router being the root cause of the problem, I suggest you simply try another router as soon as you can.