I have my own mail server. I am running RED HAT 9 /sendmail.
Everyday I am getting password hack attempts. Some try 3-4 times and can't get in and quit others are relentless. I am lucky so far and have not been hacked. I would like to take the relentless offenders and deny their IP. I know they can get on another computer but if I can at least lock the doors and keep the general hackers out I would at least be doing something. Anyways I believe hosts.deny only says not to allow IP's not to use my services. but is there a better way of doing this? Is there a way I can get my NIC card not to let certain IP's to even attempt?
I hope this makes sense,