Kaspersky firewall: every hour my firewall tells me about attack. Is it normal?



Hello,
I have installed Kaspersky firewall and from a little time
every hour my firewall tells me about
Helkern and DDoS attack.
It tells me these attacks have been rejected.
I think firewall works fine but is it normal to have many, many
attacks every day (30-40 attacks)?
thanks

bye Adriano
.