How do I filter UDP request discarded lines from my log file?

[DCGOVDUDE]

Continually receive the following in my log files on my ASA 5505.  How can I filter this from the log so it doesn't impact the performance of the device?

Oct 25 2010 16:39:09: %ASA-7-710005: UDP request discarded from 0.0.0.0/8116 to inside:198.x.x.0/8116
Oct 25 2010 16:39:09: %ASA-7-710005: UDP request discarded from 0.0.0.0/8116 to inside:198.x.x.0/8116
Oct 25 2010 16:39:09: %ASA-7-710005: UDP request discarded from 0.0.0.0/8116 to Outside:198.x.x.0/8116
Oct 25 2010 16:39:09: %ASA-7-710005: UDP request discarded from 0.0.0.0/8116 to inside:198.x.x.0/8116
Oct 25 2010 16:39:09: %ASA-7-710005: UDP request discarded from 0.0.0.0/8116 to inside:198.x.x.0/8116
Oct 25 2010 16:39:09: %ASA-7-710005: UDP request discarded from 0.0.0.0/8116 to Outside:198.x.x.0/8116
Oct 25 2010 16:39:09: %ASA-7-710005: UDP request discarded from 0.0.0.0/8116 to Outside:198.x.x.0/8116

[Jitendriya Athavale]

use the following command to stop generating the reqd logs

no logging 710005

http://www.cisco.com/en/US/docs/security/asa/asa82/command/reference/l2.html#wp1773284

but my question here would we why do we see these in the first place src as 0.0.0.0 looks like an attack