Well you could set up internal dns for your network. For example you could setup a 1.168.192.in-addr.arpa zone file and put ptr records in their for your machines. And also maybe setup all your machines on your domain i.e if you use mydomain.com you could have a mydomain.com zone file where you had delltower.mydomain.com IN A 192.168.1.100. Of course you should only allow queries to these private zones from your local LAN. >
Apr 16 00:40:29 linux166 sshd[282]: log: Address 192.168.1.100 maps to delltower, but this does not map back to the address - POSSIBLE BREAKIN ATTEMPT!
I have the following entry in the /etc/hosts: 192.168.1.100 delltower
Can anyone help me understand how this does not map back works, or a way to fix it so I don't get this breakin attempt. That way a real breakin attempt will catch my attention.
Thanks Mark Condic
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