By default we'll use the DNS for the web application URL to crawl the web app and perform scanning. If you select a DNS override record, we'll use the mappings in your record instead.
There a few reasons you might want to do this. For example your web application does not have a DNS entry since it's in a non-production environment. Or the web application may have a different IP address in a non-production environment (e.g. development or QA) than in production.
1) Go to Configuration > DNS Override and select New (above the list).
2) Tell use the DNS settings you want to use for scanning.
3) Launch a scan and select your DNS override record.
It's easy. Apply tags to your DNS override record. Then make sure the intended users have a tag in their scope that matches a tag applied to your record.
You can assign one default DNS override records to a web application. When assigned we'll use all the mappings in all of the selected records by default, each time a scan is launched on that web app.