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# Make a new chain named '''MYICMP'''.
# Add a rule to the beginning of the '''INPUT''' chain to send '''ICMP''' packets to your '''MYICMP''' chain.
# Find a partner and get the ipaddress and MAC address of their '''external facing interface''' (Google this term to determine that public IP Addressshould be an internal address beginning with 10.x.x.x) .
# Add a rule to your '''MYICMP''' chain that allows '''ICMP''' packets coming in from '''192.168.X.0/24''' (i.e. your internal network).
# Add a rule to the beginning of your '''MYICMP''' chain that denies '''ICMP pings''' originating with MAC address of your partner's machine.
