[Samba] How does Samba find a domain controller?

[Gautier, B (Bob)]

During some recent testing of winbindd (3.0.22) in a multi-domain,
multi-DC AD context, the AD expert I was working with was very
interested in winbindd's choice of domain controller (it apparently was
not choosing the one(s) AD-expert expected).

I understand that Windows domain members have an algorithm based on DNS
SRV records and IP address comparison, and I've seen some code posted in
the last few days that suggests this is only 'under development' for
Samba.

Can someone spell out to me the way Samba looks up DCs and chooses
amongst them?  For extra points: is there a way we can influence the
choice?

Thanks,

Bob Gautier
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