[Samba] How does Samba find a domain controller?
Gautier, B (Bob)
Bob.Gautier at rabobank.com
Fri May 5 13:47:30 GMT 2006
> -----Original Message-----
> From: Gerald (Jerry) Carter [mailto:jerry at samba.org]
> Sent: 05 May 2006 14:35
> To: Gautier, B (Bob)
> Cc: samba at lists.samba.org
> Subject: Re: [Samba] How does Samba find a domain controller?
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> Gautier, B (Bob) wrote:
> >> The recommendation in the smb.conf manpage is 'name
> resolve order =
> >> wins bcast' when you are in security=ads mode, with a
> remark that in
> >> that case ADS-style DNS lookups are done anyway, first. Is my
> >> reading right?
> If the man page says that, it's wrong. DNS lookups are only
> performed if you have host in the 'name resolve order'
> list. I can double check, but I'm pretty sure this is how we
> coded it up.
> > Samba 3.0.23 will query the correct
> > _ldap._tcp.dc._msdcs.<domain> name and includes affinity
> for a server
> > once connected so that for example winbindd will reconnect to the
> > server used during the domain join to avoid lags in
> replication delays
> > between DCs.
> >> Is that in pre1, or still to come?
> The server affinity patches are in 3.0.23pre1. The new DNS
> lookup routines are still in development.
> >> So as I understand it there is no plan to do any 'nearest DC'
> >> guessing (which is what Windows appears to do, based on IP address
> >> comparisons) but we can influence choice of DC by what we
> put in the
> >> DNS in the first place, and by firewalling to prevent access to
> >> inappropriate (e.g. offsite) DCs?
> You mean the Site name stuff ? I'm working on integrating
> the CLDAP queries but I haven't looked at the Site stuff much.
> We used to pick DC's based on network address and that was horrible.
I might mean Site name stuff -- my understanding of exactly how Windows
does it is hazy. I've got enough detail for my purposes now, and
knowing that Samba once *did* do address-based choice, has stopped, and
presumably won't ever do it again is useful.
> Note that for you own domain you can specify 'password server
> = foo.dom.ain *' to give preference to a specific DC. This
> doesn't work for trusted domains though.
Another useful trick!
> cheers, jerry
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