Problem with security log

[Marcin]

Hi folks,

For some time in the file / var / log / security appear illegible entries:
kernel: ipfw: 200 Deny UDiPp f1w9:2 .168.10.5:5230503 D22e4n.y0
.U0D.P25 1:15923.5136 o8.u10t. 5va5 3r5e03 224.0.0.251:5353 in via re0

How to get rid of it? Please help...

Thanks,
Nickson