hi! what is dos attack? from last post about service attack i came to know about it, i wonder how many types of attacks exist. anyway where do i understand that from dos attack we mean to write some commands in dos which conitnuously send data to victim computer. FOREXAMPLE ping <someip> -t. Another good example is mail bombering. but i've pinged ten times my own network, but my server handle it. THe question is how much amount of data required to crach a system through dos attack. my server is configured at windows2000. By the way for real newbies, one could save himself from such attacks by using any firewall, i prefer zonealarm pro.