+-----+ DNS configuration +-----+
             |                               |
             |                               |
             | Hostname      _______________ |
             | Primary DSN   192.168.10.1___ |
             | Secondary DNS _______________ |
             | Tertiary DNS  _______________ |
             | Search        localdomain____ |
             |                               |
             |   +----+      +----------+    |
             |   | Ok |      | 取り消し |    |
             |   +----+      +----------+    |
             |                               |
             |                               |
             +-------------------------------+

Primary DSN……?