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In this investigation, we will use shell scripting to help automate our firewalls, and create our own customized chains for packet filtering.
===Automating Firewall Settings by Using a Bash Shell ScriptFirewire===
'''Perform the Following StepsNOTE THE FOLLOWING TIPS:'''
# Start with the default settings. When you install Iptables in CentOS it already has some rules predefined. You will get the default rules if you restart the iptables service.