[CentOS] SSH attacks from china

Fri Jul 24 12:00:25 UTC 2009
Ralph Angenendt <ra+centos at br-online.de>

John wrote:
> Using a non default port is not the solution, because history has learned 
> that security by obscurity never worked.....

It's not "security by obscurity", moving the default port is just to not
see all that garbage in the log files - as the automated scripts don't
check for ssh on different ports than 22. 

And save cpu cycles by not having to answer to those requests.

> 1: Use Iptables or other firewall in front of server,  to only allow a 
> selected group of "trusted" Ip's to access the server trough SSH.

Well, that is not always possible or wanted.

> 2: Enforce Public / Private key Authentication, so that only the users with 
> a valid key can access the server.

And yes, you shouldn't be using ssh with password authentication, true.

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