This topic describes the software requirements to run Domain Name System (DNS) on your iSeries™ server.
The DNS option (Option 31) does not install automatically with the base operating system. You must specifically select DNS for installation. The new DNS server added for OS/400® V5R1 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 OS/400 V5R1.
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, you must 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 iSeries to send updates to this DNS server, Option 31 must be installed on DHCP iSeries as well. The Dynamic Host Configuration Protocol (DHCP) server uses programming interfaces provided by Option 31 to perform dynamic updates.