I couldn't help but notice that alot of data goes through my router : 192.168.1.100:137 to 192.168.1.255:137 UDP protocol. I discovered this problem just now looking through peerguardian. It sends 2 times every two seconds, and I am not sure what to do about it should I be concerned? Basically router sends data to itself. Any help?

Heya dobry

and welcome at GSF -;)
Let me ask you if you have a "home network"? The IP-address, you told us 192.168.1.xxx is typical for home networks.

Note all your computers of your network by its single address and check please, if an IP does match with the given ones here. The way you've posted here you must have computers from xxx.xxx.xxx.100 to xxx.xxx.xxx.250 and that means a lot of boxes....
Please check that and we'll find answers, kay?

Regards
B. Udo