Hackers Attack?

Hello,
I've recently installed snort to control the attacks of hackers on my server, and immediatly I received this log, I have to be warried about? What I have to do?
Thank you

Active System Attack Alerts
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Mar 7 17:47:36 www iplog[5735]: ICMP/UDP: smurf attack detected from 216.177.33.0
Mar 7 17:49:49 www iplog[5735]: ICMP/UDP: smurf attack detected from 209.51.128.0
Mar 7 17:50:15 www iplog[5735]: ICMP/UDP: smurf attack detected from 161.58.153.0
Mar 7 17:59:34 www iplog[5736]: ICMP/UDP: smurf attack mode expired for 216.177.33.0 - received a total of 777 packets (49728 bytes).
Mar 7 17:59:37 www iplog[5736]: ICMP/UDP: smurf attack mode expired for 209.51.128.0 - received a total of 648 packets (41472 bytes).
Mar 7 17:59:39 www iplog[5736]: ICMP/UDP: smurf attack mode expired for 161.58.153.0 - received a total of 624 packets (39936 bytes).
Mar 7 18:04:47 www iplog[5735]: ICMP/UDP: smurf attack detected from 216.177.33.0
Mar 7 18:05:01 www iplog[5735]: ICMP/UDP: smurf attack detected from 209.51.128.0
Mar 7 18:05:11 www iplog[5735]: ICMP/UDP: smurf attack detected from 161.58.153.0
Mar 7 18:51:40 www iplog[5736]: ICMP/UDP: smurf attack mode expired for 216.177.33.0 - received a total of 2848 packets (182272 bytes).
Mar 7 18:51:41 www iplog[5736]: ICMP/UDP: smurf attack mode expired for 209.51.128.0 - received a total of 2835 packets (181440 bytes).
Mar 7 18:51:41 www iplog[5736]: ICMP/UDP: smurf attack mode expired for 161.58.153.0 - received a total of 2826 packets (180864 bytes).
Mar 7 18:58:23 www iplog[5735]: ICMP/UDP: smurf attack detected from 64.21.5.0
Mar 7 18:58:45 www iplog[5735]: ICMP/UDP: smurf attack detected from 64.21.152.0
Mar 7 18:58:51 www iplog[5735]: ICMP/UDP: smurf attack detected from 130.94.170.0
Mar 7 19:48:20 www iplog[5736]: ICMP/UDP: smurf attack mode expired for 64.21.5.0 - received a total of 3031 packets (193984 bytes).
Mar 7 19:48:21 www iplog[5736]: ICMP/UDP: smurf attack mode expired for 64.21.152.0 - received a total of 2944 packets (188416 bytes).
Mar 7 19:48:23 www iplog[5736]: ICMP/UDP: smurf attack mode expired for 130.94.170.0 - received a total of 3025 packets (193600 bytes).

 

 

 

 

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