[Niyol]

Hi
I don't think I have Malware or anything bad infecting my machine but I have been seeing my fire wall block the same thing day in day out, it blocks twice every min, I'm curious as to what may be doing this. I have researched it online but found differing answers.
Look forward to finding out just what this is, here is a snippet of the logs.
Thank you for any assistance provided.

o0o


Date/Time Direction Local IP Remote IP Protocol Application
08:50:44 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:50:14 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:49:45 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:49:15 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:48:45 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:48:15 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:47:45 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:47:15 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:46:45 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:46:15 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:45:46 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:45:16 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:44:46 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:44:16 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:43:46 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:43:16 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:42:46 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:42:16 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:41:47 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:41:17 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:40:47 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:40:17 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:39:47 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:39:17 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:38:47 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:38:17 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:37:47 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:37:18 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:36:48 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:36:18 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:35:48 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:35:18 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:34:48 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)
08:34:18 05/07/2013 In 192.168.1.255:520 (efs) 192.168.1.1:520 (efs) UDP (17)