> > > OK so 1024 getchallenge packets every 40 milliseconds. Each getchallenge > packet's payload is about 20 bytes or so. Add the UDP header and that > probably goes up to about 40 bytes (I actually don't know how bit the UDP > headers are off hand, would have to read the specs). OK, so I need to send > 40x1024 bytes every 40 milliseconds to do my denial of service attack. 1000 > (1 second) divided by 40 millis is 25, so I need to send 25x40x1024 bytes > per second. That's 1 megabyte per second, or 8 megabits per second. It's > quite a lot of bandwidth for the job, but it would be effective (I have not > actually tested this, but a program would be easy enough to write). >
Not so fast. Coming from one machine, that would be difficult. You can't simply take the sizes and multiply them and conclude that you'd need that fast a pipe to DoS someone.You'd be lucky your ISP even took that garbage from you without throttling you. At 1024 packets in 40 msec, you're really talking > 25K packets/sec, which likely won't happen from one machine, even if you had a theoretically large enough pipe simply due to the routing hardware dropping them -- remember, sending a packet generates an interrupt and that's 25K interrupts/sec... from a single machine, and you can be sure the router has plenty of other traffic to handle. Even a DDoS might fail -- you'd kill the routers in-between but not the machine, or cause their ISP to block /your/ traffic.
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