Hello,
Can you clarify for me exactly what dns_lookup_kdc does?

I am trying to help a user debug something. The user's config file has 
dns_lookup_kdc=false
under [libdefaults]
and then does not specify any realms under [realms].
To my intuition, it should mean that nothing works at all.
But experimentally, it does work.
Doing some tcpdumping, I can see it do a DNS lookup to find the KDCs, even 
though dns_lookup_kdc is set false.

Perhaps the dns_lookup_kdc only affects realms that are defined in your 
[realms] section?

Thank you for your help,
Jerry


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