Oracle Advansed Security question

Hello
I am installing Oracle Advanced Security using kerberos v5. The problem is - I don't know format of the configuration file (krb.ini | krb.conf)
With file I tried okinit return error "can't find KDC for requested realms". At the same time kinit with the same file returned no error. So I guessed - I tried wrong format of the configuration file. In Oracle Advanced Security Administration Guide I did not found any allusion. Could anyone show me format of the file? Or where should I search for?

PS: or I am mistaken and I wrongly determined the problem?

Thank you.

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WBR
Boris