turning off the computer

turning off the computer
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Subject Author Date
turning off the computer *selah* 10-20-2005
Posted by *selah* on October 20, 2005, 5:32 am
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I recently read that turning off the computer is a good way to prevent
virus and hacker attacks. I think it was said that the reason for this
is that the server assigns a new ip address each time you reconnect.

Is there any validity to this?



Posted by Spack on October 20, 2005, 11:06 am
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*selah* wrote on Thu, 20 Oct 2005 05:32:34 -0400:

> I recently read that turning off the computer is a good way to prevent
> virus and hacker attacks. I think it was said that the reason for this
> is that the server assigns a new ip address each time you reconnect.
>
> Is there any validity to this?

Many ISPs use "sticky" DHCP assignment - you often get the same IP you had
before. At the very least you'll get one in the same IP block, and many
worms attack entire blocks rather than specific IPs (or will hit random
addresses within a range). Also, there's nothing preventing your ISP
assigning you an IP that was already the target of an earlier attack when it
was assigned to someone else who has now released it/turned their PC off.

Turning the PC off is a good way to prevent virus and hacker attacks from
the point of view that if the machine isn't on, there's nothing to attack!

Dan




Posted by Chuck on October 20, 2005, 11:29 am
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On Thu, 20 Oct 2005 05:32:34 -0400, "*email_address_deleted*" <a> wrote:

>I recently read that turning off the computer is a good way to prevent
>virus and hacker attacks. I think it was said that the reason for this
>is that the server assigns a new ip address each time you reconnect.
>
>Is there any validity to this?

No.
1) Getting a different IP address is just another form of Security By
Obscurity.
2) The bad guys don't maintain a fixed database of available IP addresses -
they just scan whenever they need, and work from what's current.
3) You can be infected in seconds - watch the BBC video. How often do you
intend to change your address?
<http://nitecruzr.blogspot.com/2005/05/security-by-obscurity.html>
<http://www.bbcworld.com/content/clickonline_archive_14_2005.asp?pageid=665&co_pageid=3>

--
Cheers,
Chuck, MS-MVP [Windows - Networking]
http://nitecruzr.blogspot.com/
Paranoia is not a problem, when it's a normal response from experience.
My email is AT DOT
actual address pchuck mvps org.


Posted by Duane Arnold on October 20, 2005, 11:36 am
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> I recently read that turning off the computer is a good way to prevent
> virus and hacker attacks. I think it was said that the reason for this
> is that the server assigns a new ip address each time you reconnect.
>
> Is there any validity to this?
>

If you're using a dial-up, you will get a different IP each time. If
you're on BB I don't know about DSL you'll get the same IP back even if
you turn the computer off for short periods due the ISP assigning an IP
to a computer's NIC (Network Interface Card) MAC through the DHCP server
at the ISP with your account that has been provisioned with the ISP. You
would have to leave the machine off for some days for a new IP to be
assigned or not pay the bill for awhile and then pay it. <g> At least
that was my experience with it on BB.

Duane :)


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