int_if=zeoip2
int_mac=00:1A:D0:11:5F:18
ext_if=eth0
ext_mac=00:02:9B:93:AC:EA

ebtables -t nat -A PREROUTING -d $ext_mac -i $ext_if -j dnat --to-destination $int_mac
ebtables -t nat -A POSTROUTING -d $int_mac -i $int_if -j snat --to-destination $ext_mac