HEY guys....can someone explain to me what is smurfing
i got this letter from my provider

Dear User
Your router has detected and protected you against an attempt to gain access to your network. This may have been an attempted hacker intrusion, or perhaps just your Internet Service Provider doing routine network maintenance. Most of these network probes are nothing to be worried about - these types of random probes should NOT be reported, but you may want to report repeated intrusions attempts. Save this email for comparison with future alert messages.
Your router Alert Information Time: 08:13:23
Message: smurf
Source: 68.94.58.XXX, 1764
Destination:216.199.XXX.XXX 3531

the destination is mine and the source is the other guys ip!

what is the point of smurfing? what can it do?
thankss