Inbound Requests

•	Inbound DNS Requests

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Listen for DNS requests on
Specify the port number and select local IP addresses on which the DNS service will be available.
NOTE: Other DNS servers and client computers expect to find your DNS server on port 53. You should only use a different port number in special situations, for example, if you are mapping port 53 on a NAT router or proxy to a different port number on this computer.

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Maximum inbound TCP connections
A hacker may try to open a lot of TCP connections to exhaust server resources.
Use this option to limit the total number of simultaneous inbound TCP connections Simple DNS Plus will accept. When this number of connections has been reached additional connection attempts are logged and then rejected.

•	When sending response

•	Enable Round Robin (rotate DNS records in responses) When this option is enabled and multiple records of the same type are defined for the same name, Simple DNS Plus automatically rotates these records in responses (See Round Robin).

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Always include NS referral in DNS responses from local zones
For most purposes is not necessary to include these extra NS-records in DNS responses, and we generally recommend leaving this option off to reduce network packet sizes and CPU usage.
However certain DNS analyzers (software / websites) may claim that your server is not configured correctly without these records.
Also certain ccTLD registrars may require these extra records when they test your DNS servers in connection with a domain name registration.
To satisfy such analyzers and registrars, simply enable this option temporarily, and then disable it again to improve performance when done.