Denied Packets?

[christian-ETYuwdzrPJK4mfPA/iJWtA at public.gmane.org (Chris Ampenberger)]

I noticed the following denied packet messages in logwatch today. All of
these are outside my home network and I wonder how they even got through
the Linksys WRT654G router. I tried Googling for them, but to no avail. 

The IP addresses are from all over the place - comcast, freeip, charter,
Germany, Denmark, 

Any thoughts or suggestions where to go next?

Denied 514 packets on interface eth0
   From 24.126.108.211 - 3 packets to udp(15974) 
   From 71.10.172.122 - 3 packets to udp(15974) 
   From 72.18.205.156 - 1 packet to udp(38229) 
   From 84.169.96.106 - 4 packets to udp(15974) 
   From 87.57.60.87 - 3 packets to udp(15974) 
   From 109.207.115.144 - 3 packets to udp(15974) 
   From 118.165.176.81 - 3 packets to udp(15974) 
   From 121.229.17.119 - 6 packets to udp(15974) 
   From 149.20.54.20 - 1 packet to udp(35103) 
   From 169.229.70.201 - 1 packet to udp(36554) 
   From 188.163.84.90 - 6 packets to udp(15974) 
   From 206.222.28.90 - 1 packet to udp(36271) 
   From 209.252.173.10 - 3 packets to udp(15974)