-change hosts file - will maintain hosts file on multipe machines.

for the scope of this type of demo network, this is much simpler
than installing and managing dns.

roles/wifi/files/iptables.ipv4.nat

@@ -0,0 +1,18 @@
+# Generated by iptables-save v1.6.0 on Thu Mar 14 09:59:15 2019
+*filter
+:INPUT ACCEPT [7056:1877085]
+:FORWARD ACCEPT [0:0]
+:OUTPUT ACCEPT [6972:1880076]
+-A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT
+-A FORWARD -i wlan0 -o eth0 -j ACCEPT
+COMMIT
+# Completed on Thu Mar 14 09:59:15 2019
+# Generated by iptables-save v1.6.0 on Thu Mar 14 09:59:15 2019
+*nat
+:PREROUTING ACCEPT [15:3832]
+:INPUT ACCEPT [15:3832]
+:OUTPUT ACCEPT [110:30472]
+:POSTROUTING ACCEPT [106:29680]
+-A POSTROUTING -o eth0 -j MASQUERADE
+COMMIT
+# Completed on Thu Mar 14 09:59:15 2019