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OPS335 Firewall Lab

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→‎Building a Simple Firewall

==Instructions==

===Building a Simple Firewall===

#*Login as joker to your Fedora 13 PC.#**It's not necessary to use a VM for this lab. Just use your original Fedora system created in lab #0.#*Open a terminal window and "su -" to root.#*Disable your current firewall. i.e. flush all rules in all chains in all tables.

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.

Paul.W

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