Create Default Blocks with IPTables

If you are configuring IPTables (or any firewall for that matter), you should always start with a block all rule. Within IPTables, it is very easy to do:

/sbin/iptables -I INPUT -j DROP -m comment --comment "Blocking all traffic by default"

This simple rule will block all communication to the server so be sure to create a whitelist for yourself as well. The last thing you want to do is block all traffic, including yourself. :)

This approach help set you into a security mindset and forces you to create a whitelist model for access. Changing your mindset goes a long way to ensuring a secure environment for your server.

Posted in   Security_Tips   Security   Linux   IPTables     by noc_team

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