[bitfolk] DDOS attempts

Hi, Has anyone else been seeing (what appears to be) DDOS attempts against their VPS's? I've been getting quite a lot of messages like this in my logs over the past few days: Sep 30 05:02:06 scruffy kernel: [2103474.700870] TCP: drop open request from 45.195.133.8/51353 Sep 30 05:02:07 scruffy kernel: [2103476.223611] TCP: drop open request from 149.56.180.255/25006 Sep 30 05:02:08 scruffy kernel: [2103476.704225] TCP: drop open request from 45.195.133.8/7947 Sep 30 05:02:08 scruffy kernel: [2103476.713872] TCP: drop open request from 149.56.180.255/31127 Any ideas also on the best way to block? (I was reading about SYN cookies, but not sure if this is a good idea or not). cheers, Matt.