iptables -A POSTROUTING -t mangle -p udp --dport 68 -j CHECKSUM --checksum-fill
# Do block ARP from ESP8266 to itself to avoid DHCPDECLINE
-#arptables -A INPUT -j DROP --source-mac 18:fe:34:db:59:72 --destination-mac 18:fe:34:db:59:72
-#arptables -A OUTPUT -j DROP --source-mac 18:fe:34:db:59:72 --destination-mac 18:fe:34:db:59:72
-#arptables -A FORWARD -j DROP --source-mac 18:fe:34:db:59:72 --destination-mac 18:fe:34:db:59:72
+arptables -A INPUT -j DROP --source-mac 18:fe:34:db:59:72 --destination-mac 18:fe:34:db:59:72
+arptables -A OUTPUT -j DROP --source-mac 18:fe:34:db:59:72 --destination-mac 18:fe:34:db:59:72
+arptables -A FORWARD -j DROP --source-mac 18:fe:34:db:59:72 --destination-mac 18:fe:34:db:59:72
# block everything except ssh, icmp, http, and dhcp
# Configure NAT