DoS attack nel registro router

[francich]

Guardando il registro del mio Netgear DGND3700v2 spuntano decine di righe del tipo:

[DoS attack: ACK Scan] from source: 66.135.211.96:443 Friday, November 07,2014 17:23:10
[DoS attack: ACK Scan] from source: 46.33.74.65:443 Friday, November 07,2014 17:21:13
[DoS attack: ACK Scan] from source: 46.33.74.65:443 Friday, November 07,2014 17:19:13
[DoS attack: ACK Scan] from source: 79.140.82.73:443 Friday, November 07,2014 17:18:14
[DoS attack: ACK Scan] from source: 195.22.200.168:443 Friday, November 07,2014 17:17:46
[DoS attack: ACK Scan] from source: 46.33.74.65:443 Friday, November 07,2014 17:17:13
[DoS attack: ACK Scan] from source: 79.140.82.73:443 Friday, November 07,2014 17:16:14
[DoS attack: ACK Scan] from source: 195.22.200.168:443 Friday, November 07,2014 17:15:45
[DoS attack: ACK Scan] from source: 46.33.74.65:443 Friday, November 07,2014 17:15:12
[DoS attack: ACK Scan] from source: 79.140.82.73:443 Friday, November 07,2014 17:14:14
[DoS attack: ACK Scan] from source: 195.22.200.168:443 Friday, November 07,2014 17:13:45
[DoS attack: ACK Scan] from source: 46.33.74.65:443 Friday, November 07,2014 17:13:12
[DoS attack: ACK Scan] from source: 79.140.82.73:443 Friday, November 07,2014 17:12:13
[DoS attack: ACK Scan] from source: 195.22.200.168:443 Friday, November 07,2014 17:11:45
[DoS attack: ACK Scan] from source: 46.33.74.65:443 Friday, November 07,2014 17:11:12
[DoS attack: ACK Scan] from source: 79.140.82.73:443 Friday, November 07,2014 17:10:13
[DoS attack: ACK Scan] from source: 195.22.200.168:443 Friday, November 07,2014 17:09:44
[DoS attack: ACK Scan] from source: 46.33.74.65:443 Friday, November 07,2014 17:09:12
[DoS attack: ACK Scan] from source: 46.33.74.65:443 Friday, November 07,2014 17:08:08

Mi devo preoccupare o è normale?