How to log dropped packet ?

["Jerry Kim" <netmask@xxxxxxxxxxxxxxxxxx>]

Hi all.

I hope to know how to log dropped/accepted packets.
For example,

iptables -A INPUT -i eth0 -p tcp -d 10.10.10.1 --dport 22 -j ACCEPT

How can I log it ?
I don't understand how '-j LOG' target operate.

Help.