What could be the cause for these strange UFW block entries in my syslog?

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http://askubuntu.com – I've recently noticed a large number of recurring UFW blocks in my syslog. This surprised me as I have no UFW rules set: $ sudo ufw status verbose Status: active Logging: on (low) Default: deny (incoming), allow (outgoing) New profiles: skip Could someone more versed with firewall configurations on Ubuntu/Linux please tell me why I am getting these entries? Apr 7 20:01:04 mhcUBN kernel: [18234.747861] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:00:00:01:00:04:0e:ef:71:fe:08:00 SRC= DST= LEN=36 TOS=0x00 PREC=0xC0 TTL=1 ID=3586 DF PROTO=2 Apr 7 20:03:09 mhcUBN kernel: [183 (HowTos)