Consider these software requirements to run Domain Name System (DNS) on your System i™ model.
The DNS option feature, Option 31, cannot be installed automatically with the operating system. You must specifically select DNS for installation. The DNS server added for i5/OS® is based on the industry-standard DNS implementation known as BIND 8. Previous OS/400® DNS services were based on BIND 4.9.3, and are still available in i5/OS.
After DNS is installed, you are by default configured to set up a single DNS server using the BIND 4.9.3-based DNS server capabilities that were available in previous releases. If you want to run one or more DNS servers using BIND 8, install PASE. PASE is SS1 Option 33. After PASE is installed, iSeries™ Navigator automatically handles configuring the correct BIND implementation.
If you do not use PASE, you will not be able to take advantage of all of the BIND 8 features. If you do not use PASE, you can still run the same DNS server based on BIND 4.9.3 that was available in previous releases. See the V4R5 DNS information center topic for BIND 4.9.3 documentation.
If you want to configure a DHCP server on a different platform to send updates to this DNS server, Option 31 must be installed on that DHCP server as well. The Dynamic Host Configuration Protocol (DHCP) server uses programming interfaces provided by Option 31 to perform dynamic updates.
Related concepts
i5/OS PASE Configuring Domain Name System