I'm using wireshark

For whatever reason I see a lot of UDP and some TCP packets coming from many WAN IP addresses hitting my Linkys router then router route these packets to my PC on the network. Most are UDP and some are TCP asking for hand shake..

None of any programs on my PC is connected to services.
So I decided to change my local ip address..so those packets are not coming to my PC, but my Router is still going crazy sending out ARP trying to find my last IP address to send these packets to..

How do I filter these type of unknown packets coming in to my linksys router?

Thanks