Attaque sur mon serveur dédié

Bonjour,
j'ai recu en email de mon hebergeur me disant que mon serveur a subi une attaque de grande ampleur la nuit dernière et voici les details de l'attaque j'aimerai bien savoir la nature de l'attaque et d'ou ça vient merci


Date flow start Duration Proto Src IP Addr:Port Dst IP Addr:Port Packets Bytes Flows
2011-09-21 20:19:51.249 19.968 TCP 41.251.126.198:1144 -> 94.247.176.75:80 8 1516 1
2011-09-21 20:19:49.580 23.296 TCP 41.251.126.198:1143 -> 94.247.176.75:80 28 5210 1
2011-09-21 20:21:49.450 201.984 TCP 66.249.71.27:53017 -> 94.247.176.75:80 45 4011 1
2011-09-21 20:25:27.050 6.016 TCP 210.97.192.240:50059 -> 94.247.176.75:80 6 520 1
2011-09-21 20:20:12.379 42.048 TCP 66.249.71.27:42869 -> 94.247.176.75:80 3 180 1
2011-09-21 20:25:43.972 17.152 TCP 210.97.192.240:50059 -> 94.247.176.75:80 2 92 1
2011-09-21 20:21:02.224 0.000 TCP 66.249.71.27:59387 -> 94.247.176.75:80 1 60 1
2011-09-21 20:21:32.681 0.000 UDP 168.126.63.15:6340 -> 94.247.176.75:53 1 67 1
2011-09-21 20:26:40.454 3.776 TCP 210.97.192.240:51266 -> 94.247.176.75:80 4 228 1
2011-09-21 20:20:08.045 405.888 UDP 67.19.249.18:44634 -> 94.247.176.75:113 22.6 M 1.8 G 1
2011-09-21 20:20:07.405 406.528 UDP 85.25.176.44:43902 -> 94.247.176.75:113 22.4 M 1.7 G 1
2011-09-21 20:20:07.473 410.496 UDP 174.123.104.181:54504 -> 94.247.176.75:113 22.5 M 1.8 G 1
2011-09-21 20:21:53.043 2.944 TCP 74.125.42.80:44777 -> 94.247.176.75:80 2 120 1
2011-09-21 20:26:57.540 0.448 TCP 210.97.192.240:51266 -> 94.247.176.75:80 3 284 1
2011-09-21 20:21:58.414 0.000 TCP 211.254.252.230:44202 -> 94.247.176.75:80 1 46 1
2011-09-21 20:22:10.639 1.536 TCP 74.125.42.84:51104 -> 94.247.176.75:80 4 208 1
2011-09-21 20:20:07.792 442.176 UDP 213.251.132.107:36281 -> 94.247.176.75:113 22.4 M 1.7 G 1
2011-09-21 20:20:08.047 449.920 UDP 207.44.244.43:58742 -> 94.247.176.75:113 22.5 M 1.8 G 1
2011-09-21 20:22:34.903 0.000 TCP 82.120.203.168:53565 -> 94.247.176.75:80 1 46 1
2011-09-21 20:20:07.984 469.952 UDP 143.206.30.116:48448 -> 94.247.176.75:113 22.5 M 1.8 G 1
Summary: total flows: 20, total bytes: 10.5 G, total packets: 134.8 M, avg bps: 172.2 M, avg pps: 275964, avg bpp: 78
Time window: 2011-09-21 20:19:49 - 2011-09-21 20:27:57
Total flows processed: 262132, Blocks skipped: 0, Bytes read: 13631064
Sys: 0.084s flows/second: 3120470.5 Wall: 0.082s flows/second: 3191127.8