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→Building a Simple Firewall
#Add a rule to the INPUT chain of the filter table to send ICMP ping packets to your MYICMP chain.
#Change the default policy on the INPUT chain in the filter table to DROP.
===Testing your custom firewall===
#Use nmap to scan your firewall from 142.204.141.XXX. If you don't have nmap on your system then install it.
#Use ping and ssh from 142.204.141.XXX (and elsewhere) to verify your firewall is working properly. Be sure to check the log file for your unsuccessful ssh attempts.
#Use iptables-save command to save Save your firewall rules.
== Completing the Lab ==
