On my machine this is logged every two minutes, making it harder to find messages of actual importance in the syslog. The clue of this message is highlighted in red; it is just your router trying to discover what machines on the network support multicast (see Wikipedia).Sep 2 21:42:47 machine kernel: [45908.536890] [UFW BLOCK] IN=eth0 OUT= MAC=00:00:00:00:00:00:00:00:00:00:00:00:00:00 SRC=192.168.1.254 DST=224.0.0.1 LEN=28 TOS=0x00 PREC=0x00 TTL=1 ID=40487 PROTO=2
It is harmless traffic, but if you prefer to keep your syslog clear of this you can do so by adding a rule to UFW:
Code: Select all
sudo ufw deny in to 224.0.0.1
Code: Select all
sudo ufw status verbose
Status: active
Logging: on (low)
Default: deny (incoming), allow (outgoing)
New profiles: skip
To Action From
-- ------ ----
224.0.0.1 DENY IN Anywhere