I am a mod for Sygate so believe me when I tell you that this is no DoS attack.

The firewall will alert you to a DoS attack and would drop the packets. Your last log shown is a traditonal ping (types 8 and 0). The reason for it being associated with ports is because its a column on the GUI. If you look at your packet log it is correctly identified by its type. ICMP is normal traffic to be seen online so no worries there. Just know that the firewall will alert you when it sees an 'attack signature'.