Can't answer if you censor all numbers... Please leave most of it except last ".". There is no security risk. Please relax.
As already indicated please specify exactly what you see in ZA firewall zones.
With the information you have provided I can only wild guess that:
The network you see in ZA 42.X.X.X/255.255.... should be set as public/Internet.
DHCP server: 1.X.X.X should be added to the ZA firewall zones (if not already there) as TRUSTED
The two DNS IPs 218.X.X.X should be added to the ZA firewall zone as TRUSTED.
With this setup you should have no problem. Remember: DO NOT change any other firewall settings.
After a week or two of use move the ZA application control (not firewall settings!) to HIGH instead of the current.