Configuring the OS/400 DNS server without OpNav

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The OS/400 DNS server can officially be configured via OpNav only. However, there are other ways…

OpNav is a component of ClientAccess for Windows, which is installed along with OS/400.

Configuration

The DNS server of OS/400 V4R2 up to and including V4R5 is based on BIND 4.9.3 from the ISC. Therefore, the configuration directives from ISC apply immediately. At startup, the system looks for the main configuration file /QIBM/USERDATA/OS400/DNS/BOOT. You can easily create this file yourself:


Dns DNS von OS/400 V4R2 bis einschliesslich V4R5 basiert auf BIND 4.9.3 vom ISC. Somit gelten auch die Konfigurationsdirektiven unmittelbar. Beim Start wird nach der Hauptkonfiguratiosndatei /QIBM/USERDATA/OS400/DNS/BOOT gesucht. Diese kann man bequem selbst erstellen: 

edtf '/qibm/userdata/os400/dns/boot'

Example file content: 

; Working Directory
directory /QIBM/USERDATA/OS400/DNS
; Root-DNS-File
cache . NAMED.ROOT
; Zone Statements
secondary myzone.com 192.168.1.11 db.myzone.com

Edtf is very similar to seu in its operation . Alternatively, this file can be created elsewhere and uploaded to the appropriate location in ASCII mode via FTP.

It is recommended to import an up-to-date root zone file. This can be obtained, for example, from Internic, and transferred via FTP to qdns/qatocdnsrv.root as well as to /qibm/userdata/os400/dns/root.hint, as specified in the corresponding directive.[1]

The directory permissions must be adjusted before starting the DNS server: 

strqsh cmd('chown qtcp /qibm/userdata/os400/dns')

Through the chgdnsa command, you can set autostart at TCP startup to *yes, as well as a desired debug level, and finally issue strtcpsvr *dns to start the server.

Less encouraging is the fact that when testing this DNS as a secondary to BIND 9.10.3 running on Debian Linux, no secondary zones can be loaded. The primary server pushes the zones out via AXFR, but the slave on the AS/400 does not accept them. According to the AXFR job log, BIND expects more data bytes than it receives. A fix to this behavior is not known.

Weblinks

  1. ↑ BIND cannot deal with a file in a library. It's unclear why there is a copy in a qsys.lib file.
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