Sofrendo ataque

Gente desde ontem no meu log DLINK (DIR-600) estou vendo que estou sofrendo um tipo de ataque e a internet um pouco mais lenta sem contar que esta caindo quase sempre .

No log (como abaixo) mostra que um tal de flooding atack de minuto em minutos de vários ips.

Como resolver isso ? E isso realmente é um ataque?

Feb 22 09:59:55 PING-FLOODING flooding attack from WAN (ip:83.136.166.163) detected.Feb 22 09:59:50 PING-FLOODING flooding attack from WAN (ip:189.104.85.71) detected.Feb 22 09:59:26 PING-FLOODING flooding attack from WAN (ip:189.77.31.213) detected.Feb 22 09:59:26 PING-FLOODING flooding attack from WAN (ip:87.28.14.59) detected.Feb 22 09:59:02 PING-FLOODING flooding attack from WAN (ip:186.212.27.240) detected.Feb 22 09:58:48 PING-FLOODING flooding attack from WAN (ip:200.6.118.98) detected.Feb 22 09:58:41 PING-FLOODING flooding attack from WAN (ip:93.181.160.119) detected.Feb 22 09:58:40 PING-FLOODING flooding attack from WAN (ip:2.137.108.15) detected.Feb 22 09:58:34 PING-FLOODING flooding attack from WAN (ip:109.164.2.49) detected.Feb 22 09:58:31 PING-FLOODING flooding attack from WAN (ip:200.204.0.10) detected.

Valeu