why this Pool Efficiency: 90% and more and more low in several days ！
We know this and we'll try our best to go back up like it was before.
The pool is under some form of an attack? Late last night total pool hash dropped by half. Am i seeing less hash rate reported due to the attack?
There are attacks multiple times a day on our pool and other pools.
It is a big issue that has been here since the start of Monero but since we upgraded our system, we are much less affected by DDoS contrary to other pools.
Yesterday one pool has been shut down because of attacks (I forgot the name).
The attackers are now trying shorter attack (in time) but more intensive.
There are no stratum TCP anti DDoS solutions like it exist with HTTP.
We found a temporal solution and it works. The only drawback is a lower reported hashrate for a short time.
Actually, our solution is a sort of failover. When an attack happen, we move the miners to an other server causing the reported hashrate to be wrong.
The reason why people attack pools is to lower the global hashrate (competition) temporally so they can mine more block in the meantime.
Don't think it is free and easy to do. These kind of specialized DDoS attacks would cost you between 5 to 30 BTC (possibly more) on the darkweb depending of the time and intensity.
If you have some suggestion on how to protect against these attacks, feel free to come and discuss it on IRC #monero-pools
