[other] Strange network traffic reported on /var/log/ufw.log

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http://ubuntuforums.org – As i wrote in the thread title, i noticed a strange network traffic reported in /var/log/ufw.log I use a NETGEAR DNG3300 that is configured to block all the incoming connections. is the computer's IP, is the ruoter IP, is the IP of an another pc in my home. UFW is configured to block all incoming connection, allowing only port 22 for SSH. I'm a networking noob, so can someone explain me what are those strange IPs? Code: Dec  6 20:40:41 raspberrypi kernel: [  45.768980] [UFW BLOCK] IN=eth0 OUT= MAC=b8:27:eb:b6:23:ac:e0:46:9a:0a:7d:3 (Hardware)