Re: individual firewalls considered useless (Re: Send local mail - how?)

From: John Hasler (
Date: 01/26/05

Date: Tue, 25 Jan 2005 17:10:26 -0600

I wrote:
> That doesn't make you invisible. If they don't get "destination
> unreachable" they know you are there.

Charles Sullivan writes:
> How would they know that if a ping of my IP elicits no response?

IF there is no computer at your IP they will get "destination unreachable"
from the upstream router.

> However a website could be set up to identify IPs of individuals whose
> interests might make them more likely to be vulnerable or to be more
> potentially profitable targets for a break-in attempt.

They could do that, but I doubt that they do. It's much easier to just
scan for vulnerable machines.

John Hasler
Dancing Horse Hill
Elmwood, WI USA

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