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OPS335 Firewall Lab

28 bytes added, 14:59, 5 September 2011

→‎Instructions

#Open a terminal window and "su -" to root.

#Disable your current firewall. i.e. flush all rules in all chains in all tables.

===Building a Custom Firewall====~~Now build~~ 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 allow all UDP traffic coming from port 53. i.e. source port is 53.

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