log: "Packet too big to attempt sublinear string search "

log: "Packet too big to attempt sublinear string search "
As you can see below, on the average 1 message / 5 second
on my logs and on all consoles !!!!

different size: 1332, 1480, 1320, 1380, It is Ethernet
MTU:1500 but I don't know if it is connection

Any ideas? I want to recover my consoles and can work!
PS. It is router, I must filter Kazaa.
PS2. Sorry for my bad English.


Sep 1 21:20:21 kernel: ipt_string: Packet too big to attempt
sublinear string search (1332 bytes)
Sep 1 21:20:26 kernel: ipt_string: Packet too big to attempt
sublinear string search (1480 bytes)
Sep 1 21:20:31 kernel: ipt_string: Packet too big to attempt
sublinear string search (1320 bytes)
Sep 1 21:20:36 kernel: ipt_string: Packet too big to attempt
sublinear string search (1332 bytes)
Sep 1 21:20:41 kernel: ipt_string: Packet too big to attempt
sublinear string search (1320 bytes)
Sep 1 21:20:51 last message repeated 2 times
Sep 1 21:20:56 kernel: ipt_string: Packet too big to attempt
sublinear string search (1480 bytes)
Sep 1 21:21:01 kernel: ipt_string: Packet too big to attempt
sublinear string search (1380 bytes)