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Added note about the lo interface.
== Firewall rules update ==
Remember that you are supposed to have a working firewall on your '''vm1''' (and every other machine), but we will focus on our vm1 machine for now. A <u>working</u> firewall will block requests to ports that you didn't explicitly allow. This means that at this point, your DNS server, even though it's perfectly configured, is <u>'''inaccessible'''</u> to any other machine because iptables won't allow the requests to come in(the machine can communicate with itself using the rule that allows all traffic on the '''lo''' interface).
You will need to update the firewall on '''vm1''' to allow <u>incoming</u> connections in '''UDP port 53''' (i.e. the protocol and port that DNS uses). After you have updated your firewall, then save your iptables rules using whatever means worked for you in the iptables labs and add it to a shell script.
'''Record steps, commands, and your observations in INVESTIGATION 1 in your OPS335 lab log-book'''
= INVESTIGATION 2: CONFIGURING THE DNS CLIENT =