ISP是中華電信100M光纖。小烏龜連到D-link的DIR-600

最近常常斷線，進入DIR-600看紀錄，出現

Jan 30 19:13:47 PING-FLOODING flooding attack from WAN (ip:149.5.0.74) detected.
Jan 30 17:47:51 PING-FLOODING flooding attack from LAN (ip:192.168.0.104) detected.
Jan 30 17:47:50 PING-FLOODING flooding attack from WAN (ip:42.120.143.145) detected.
Jan 30 17:47:49 PING-FLOODING flooding attack from WAN (ip:42.120.143.145) detected.
Jan 30 16:19:58 PING-FLOODING flooding attack from WAN (ip:149.5.0.74) detected.
Jan 30 15:49:29 PING-FLOODING flooding attack from WAN (ip:220.128.16.170) detected.
Jan 30 15:49:23 PING-FLOODING flooding attack from WAN (ip:168.95.220.50) detected.
Jan 30 15:49:22 PING-FLOODING flooding attack from WAN (ip:168.95.98.254) detected.

google查了一下，看來是封包攻擊。改掉WAN PING不要有反應以外。要怎麼處理這個問題啊?