National Instruments ENET-232 Series, Manual

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Because there are many other possible reasons for failure, contact your
network administrator if you are having problems getting DHCP to work.
When you can use DHCP and DNS successfully, you can use the
hostname form of the IP address to communicate with your product—
even if the numerical IP address changes with successive reboots.
If you are setting up a small network for your instrumentation system,
National Instruments recommends using static IP addresses, because
they are easier to implement and maintain. In this system, you can safely
use the numerical form of the IP address to communicate with your
product because the address is unlikely to change. Small networks are
less likely to have domain name services available that would resolve the
hostname into a numerical IP address.