kernel logging network traffic

[Chris Hare]

I am seeing messages such as these in /var/log/messages
 
Feb 19 23:38:06 radio kernel: Inbound IN=eth0 OUT=
MAC=00:20:ed:17:25:3d:00:11:1
1:2b:ad:cc:08:00 SRC=192.168.1.20 DST=192.168.1.21 LEN=48 TOS=0x00 PREC=0x00
TTL
=128 ID=7875 DF PROTO=TCP SPT=3221 DPT=1984 WINDOW=65535 RES=0x00 SYN URGP=0
 
Not sure what I did to turn this on, but I would really like to disable it
..... 
 
Any ideas where it is coming from and how to stop it?
 
Thanks.