IPTables rules based on mac-address
Here lets learn how to block a host based on his MAC-ADDRESS. So that he cannot change the IP to try get access. (in case he has changed the nic card also, i should not be contacted)
I am showing you how to use mac address in IPTables to create rules for accept or reject.
iptables -A INPUT -p tcp –destination-port 22 -m mac –mac-source 11:22:33:44:55:66 -j REJECT
Just replace 11:22:33:44:55:66 with the actual mac-address of the host.
Here is a small demo based on this tip for SSH.
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