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→Building a Simple Firewall
==Instructions==
===Building a Simple Firewall===
Build a custom firewall by performing the following steps:
#Add appropriate rule(s) to allow all traffic to/from the loopback 'lo' interface.
#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.
