What are these and how can I not log them?

[Simon <tanstaafl@xxxxxxxxxxxxxxx>]

Hello,

Very new to iptables and firewall, so please be gentle... :)

I'm getting a lot of the below messages - sometimes bursts of a hundred 
or more, but usually just one or two here and there - in my logs:

Jul  7 17:52:46 myhost IPTABLES-IN Default Drop: IN=eth0 OUT= 
MAC=ff:ff:ff:ff:ff:ff:00:08:9b:ac:c3:41:08:00 SRC=192.168.1.75 
DST=192.168.1.255 LEN=78 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP 
SPT=137 DPT=137 LEN=58

I'm guessing it is something to do with IPv6.? But all I really want to 
know is why are they being blocked and/or how can I stop seeing these in 
my logs?

Thanks...
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