If you need to call the target server with a domain name which is not registered in DNS server, usually this is done by adding the host entry in /etc/hosts. However configuring the tens of agents takes time. So.. nGrinder ships with custom DNS service internally. Instead of touching /etc/hosts, you can configure this on the Target Host field in the nGrinder test configuration. This settings will be automatically distributed when the test is executed. Just put the host name and IP pair in the target host files in the test configuration page. That's it.