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→Building a Simple Firewall on VM1
===Building a Simple Firewall on VM1 ===
'''On your VM1, open another "root" terminal and 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.