Re: FQDN - DNS resolution

From: ptwilliams (ptw2001_at_hotmail.com)
Date: 01/18/05 

Date: Tue, 18 Jan 2005 12:26:48 -0000

No problem ;-) 

-- 
Paul Williams
http://www.msresource.net
http://forums.msresource.net
"Morag" <Morag@discussions.microsoft.com> wrote in message 
news:5ACE99B4-07E2-4DFE-8750-224FBC73C70F@microsoft.com...
Thank you - that explanation was exactly what we needed.
Morag
"ptwilliams" wrote:
> If you ping mydomain.co.uk you will get the IP address of one of the 
> records
> that look like (same as parent folder) in the DNS console.
>
> If you only have one DC, this will always be the same.
>
> If you have multiple DCs in a single site this will be load-balanced, e.g.
> the first is passed, then the second, etc. (from the server -the client 
> will
> cache the first and use it again).
>
> If you have multiple DCs in multiple sites, you will get load-balencing
> based on your subnet.  So if you're in a remote site with two DCs and 
> there
> are other DCs in other sites, clients in your site will get the first, 
> then
> the second, then the first, etc.
>
> This is because the DNS server is using a feature called round-robin 
> (basic
> load-balencing) and net-mask ordering (subnet prioritisation).
>
> Basically, when you ping the domain name you get a DC returned.  You can
> also connect to \\domain-name.co.uk (a Dfs referral), bind to the domain
> using domain-name.co.uk (serverless bind), etc.
>
> Hope this helps,
>
>
> -- 
>
> Paul Williams
>
> http://www.msresource.net
> http://forums.msresource.net
>
>
> "Morag" <Morag@discussions.microsoft.com> wrote in message
> news:EAA000C9-55C5-4C72-AAFE-4BDA3B2003D1@microsoft.com...
> Can anyone tell me what result I should expect if I ping mydomain.co.uk -
> the
> IP address of any DC in the AD or specifically the IP address of the DC 
> that
> is the PDC Emulator (Global Catalog/Bridgehead server at central site - I 
> am
> located at the central site) ?
>
> "Herb Martin" wrote:
>
> > "Morag" <Morag@discussions.microsoft.com> wrote in message
> > news:AB209474-62C1-4710-B88D-EDD15E6B9FA0@microsoft.com...
> > > We are not having a problem with authentication or name resolution -
> > > these
> > > are both working corrrectly. If we ping machinename.mydomain.co.uk - 
> > > we
> > get
> > > the correct ip address. Nslookup shows we are using the correct local
> > > DNS
> > > server.
> > >
> > > We just want to understand  what to expect if we ping mydomain.co.uk
> > > (with
> > > no host name. As I mentioned we get the IP address of one of the 
> > > remote
> > site
> > > DCs and not the PDC Emulator DC which is on our local site.
> >
> > All of the DCs register a name equal  to their own (AD) domain.
> >
> > BTW, none of what you offered (despite common mistatements
> > by just about everyone) are "FQDN".
> >
> > An FQDN is one that is terminated in a "." (DOT) and
> > might be a zone name, or a machine name (which in DNS
> > are also domain names again despite the common error
> > of meaning a "dotted DNS name" instead of a FQDN.)
> >
> > These are a FQDN:   www.microsoft.com.   com.  even "."
> >
> > These are not:   www.microsoft.com  microsoft.com etc
> >
> > -- 
> > Herb Martin
> >
> >
> > "Morag" <Morag@discussions.microsoft.com> wrote in message
> > news:AB209474-62C1-4710-B88D-EDD15E6B9FA0@microsoft.com...
> > > We are not having a problem with authentication or name resolution -
> > > these
> > > are both working corrrectly. If we ping machinename.mydomain.co.uk - 
> > > we
> > get
> > > the correct ip address. Nslookup shows we are using the correct local
> > > DNS
> > > server.
> > >
> > > We just want to understand  what to expect if we ping mydomain.co.uk
> > > (with
> > > no host name. As I mentioned we get the IP address of one of the 
> > > remote
> > site
> > > DCs and not the PDC Emulator DC which is on our local site.
> > >
> > > Thanks
> > > "Desmond Lee" wrote:
> > >
> > > > If you do a ping FQDN_host_name, the request is directed to the
> > host_name as
> > > > recorded in DNS / WINS (or broadcast as the case may be). This is
> > > > normal
> > > > behavior and has nothing to do with AD.
> > > >
> > > > DNS is used by Win 2000 / XP to locate AD services such as a DC,
> > > > Global
> > > > Catalog, etc. Perhaps this is what you are looking for? In this 
> > > > case,
> > > > provided that the AD Site design is properly setup (IP subnets 
> > > > mapped
> > > > correctly), the phenomenon where a Win client gets authenticated by 
> > > > a
> > > > DC
> > in
> > > > another site could happen.
> > > >
> > > > Do let us know if this helps.
> > > >
> > > > "Morag" wrote:
> > > >
> > > > > We have 2 sites. Local HQ and Remote site, both have 2 DCs (also 
> > > > > AD
> > > > > Integrated DNS).
> > > > >
> > > > > If we "ping fqdn" (eg. ping mydomain.co.uk ) we get the IP address
> > > > > of
> > one of
> > > > > the Remote Site DCs - we expected to get the IP address of one of
> > > > > the
> > local
> > > > > DCs (which is the PDC Emulator).
> > > > >
> > > > > What should the domain resolve as - the PDC emulator or any DC in
> > > > > the
> > domain ?
> >
> >
> >
>
>
>

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