>And the ip addresses are dynamic so there's no way that even an ip can 
>be hijacked?

The IP being hijacked is not the same thing as the computer being hacked. 
Although, I don't know of anyone "hijacking" an IP. I know of getting 
applications onto computers to make them a zombie for you for things like 
ddos attacks, but that is hacking the computer, not really the IP, and 
again, that can't be done if the machine is off.

I also know of spoofing an IP to make it look like you are coming from an 
IP that you are not, but that can be done regardless of your 
on/off/online, or anything else status. That has nothing to do with a 
computer being hacked and everything to do with the "hackers" setup and 
abilities.

>On these lists a lot of people attest to NEVER 
>shutting down their macs. These users are more vulnerable then because 
>even sleep won't protect the hard drive from a hacker using a program to 
>access hard drives?

A sleeping computer, although can be signficantly harder to attack, is 
not impossible. Particularly as more and more machines are supporting 
"Wake On LAN" where they can be woken from sleep due to ethernet activity 
addressed to them. 

Also, depending on the computer and setup, a sleeping computer might not 
really be "asleep". It might have just shut down certain components and 
left enough running that things such as server software is still running 
(my home PC is like that, I can put it to sleep and still read/write to 
its shared directories from my Mac, so it isn't REALLY asleep as the file 
server is still running).

-chris
<http://www.mythtech.net>


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