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How to protect linux server from hackers using iptables

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Last Modified: 2013-12-16
I connected my Linux server in internet using static ip. I want to secure my linux server from hackers using iptables. I am new to iptables. we using only ssh in that server. I have configured RSA key based authendication. I want to know how to secure my linux server from hackers by blocking which port etc...
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Commented:
And building on the previous comment the next step is to only allow stuff outbound as well. One primary goal of Crackers (we reserve the name hackers for people that like to hack stuff, i.e. not bad people...) is to be able to send spam.

So blocking outbound mail could be a good idea as well.

Cheers,

Jonas
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You only need to worry about Fail2Ban if you're permitting SSH from any IP:

iptables -INPUT -p tcp --dport 22 -j ACCEPT

If you permit SSH only from specific IP's:

iptables -INPUT -p tcp --dport 22 -s xxx.xxx.xxx.xxx -j ACCEPT

then Fail2Ban isn't necessary - it is a great tool though if (like me) you use SSH from anywhere....
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