Test SSH Key Locally Without Server

To test a generated ssh private/public key-pair without having to connect to a SSH server we can use ssh-keygen. Here's the example:

# ssh-keygen -y -f /location/of/the/private-key

References

• http://stackoverflow.com/questions/9466539/how-can-i-test-my-ssh-keys-locally-without-a-server

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How To Block IP Address using IPTABLES

Make sure running the iptables command as root. Example below shows how to block traffic coming from IP 1.2.3.4.

# iptables -I INPUT -s 1.2.3.4 -j DROP

Turn on some logging on those rule, we insert it at line two. Assuming the first iptables command was the at line one.

# iptables -I INPUT 2 -s 1.2.3.4 -j LOG --log-prefix "Dropped an As*hole"

References

• http://www.cyberciti.biz/faq/linux-iptables-drop/
• http://gr8idea.info/os/tutorials/security/iptables9.html

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