On Tue, 29 Dec 2009 12:45:36 +0100, Edwin Groothuis <ed...@mavetju.org>
wrote:
On Mon, Dec 28, 2009 at 10:44:41AM -0500, Andresen, Jason R. wrote:
The point is, if your machine is on the internet, then bots are
going to try password attacks on any open port they can find. It's
just the sad fact of life on the current internet. Unfortunately,
this activity will also make it much more difficult to determine
when you are under attack from an actual person, which was my point
earlier. It's one that is not going to be easy to solve either,
unless you're willing to rewrite SSH to require every connection
attempt to pass a Turing test or something.
The turing test is a private/public key with a passphrase. And disable
passwords.
On all systems which need to be accessible from the public Internet:
Run sshd on port 22 and port 8022. Block incoming traffic on port
22 on your firewall.
Everybody coming from the outside world needs to know it is running
on port 8022. Everybody coming from the inside world has access as
normal.
Edwin
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