[cifs-protocol] [REG:210050354365053002] more ms-dfsc.pdf questions
Obaid Farooqi
obaidf at microsoft.com
Thu May 13 09:07:49 MDT 2010
Hi Matthieu:
I'll research your follow up questions and will get back to you as soon as I have something concrete.
Regards,
Obaid Farooqi
Sr. Support Escalation Engineer | Microsoft
-----Original Message-----
From: Matthieu Patou [mailto:mat+Informatique.Samba at matws.net]
Sent: Thursday, May 13, 2010 3:00 AM
To: Obaid Farooqi
Cc: MSSolve Case Email; pfif at tridgell.net; cifs-protocol at samba.org
Subject: Re: [REG:210050354365053002] more ms-dfsc.pdf questions
On 12/05/2010 01:32, Obaid Farooqi wrote:
> Hi Matthieu:
> We have finished our investigation on your question regarding the effect of site on the DC referral response. A future version of MS-DFSC will incorporate the additions/modification as follows:
>
> Additions to Section " 3.3.1 Abstract Data Model"
> -------------------------------------------------------------
> 3.3.1.1 Algorithm for sorting target sites in referral response based on site location
> DFS server places target servers in the referral response in the following order:
> - Targets in the same site as the client are listed at the top of the referral response in random order.
> - Targets outside of the client's site are appended to the response in random order.
>
> 3.3.1.2 Algorithm for sorting target sites in referral response based on site referral cost
> The server MUST place the targets in the referral response in the following order:
> 1. Targets in the same site as the client are listed in random order at the top of the
> referral.
> 2. Targets outside of the client's site are listed in order of lowest site cost to highest site
> cost. Referrals with the same cost are grouped together and within each group the
> targets are listed in random order.
>
> Additions to Section "3.3.5.3 Receiving a DC Referral Request"
> -----------------------------------------------------------------------------
> The server MUST place target servers in the DC referral response according to the site location
> as specified in section 3.3.1.1
>
> When least expensive target selection is enabled<WBN>, the server MUST place the targets in
> the referral response as specified in section 3.3.1.2
>
> <WBN> On Windows, least expensive target selection is enabled by setting SiteCostedReferrals
> value in the registry key
> HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Dfs\Parameters\ to 1.
>
>
> Additions to Section "3.3.5.4 Receiving a sysvol Referral Request"
> ---------------------------------------------------------------------------------
> The server MUST place target servers in the DC referral response according to the site location
> as specified in section 3.3.1.1
>
> When least expensive target selection is enabled<WBN>, the server MUST place the targets in
> the referral response as specified in section 3.3.1.2
>
> <WBN> On Windows, least expensive target selection is enabled by setting SiteCostedReferrals
> value in the registry key
> HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Dfs\Parameters\ to 1.
>
>
> Modification to Section " 3.2.5.5 Receiving a Root Referral Request or Link Referral Request"
> ----------------------------------------------------------------------
> ------------------------------------------
> The following bullet:
> " If DFS referral site costing is enabled, sort the targets into target sets of increasing site cost from the target to the client."
>
> will be modified as:
> " If DFS referral site costing is enabled, sort the targets into target sets as specified in section 3.3.1.2."
>
>
Ok it looks better, can I see the resulting pdf ?
What about
> I'll answer your questions in Q&A format for clarity.
>
> Q. Also where those parameters (same-site target, least-expensive, ...) are stored (in the DS or somewhere else).
>
> A. The information about sites and cost is stored in Active Directory. For information related to sites (and cost), please refer to section " 7.1.1.2.2 Sites Container" of MS-ADTS.
>
Well here my question was more about the parameters, for instance the least-expensive parameter is called SiteCostedReferrals and is stored in
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Dfs\Parameters\.
At least there is the same-site parameter that influence the way DFS referral are answered, where this parameter is stored ? Is there any other parameter that influence DFS ?
> Q. The next paragraph sates: "From the IP address of the client, determine the site of the client" what should happen is the client is not in a site (for instance if it has a static ip and the admin forgot to declare this subnet in one site)?
>
> A. Please see section 3.3.1.1, above.
>
>
Ok so we consider that a client not within a site has all the DCs out of his site right ?
>
> Please let me know if this answers your question. If it does, I'll consider this issue resolved.
>
> Regards,
> Obaid Farooqi
> Sr. Support Escalation Engineer | Microsoft
>
>
>> ________________________________________
>> From: Matthieu Patou [mat+Informatique.Samba at matws.net]
>> Sent: Sunday, May 02, 2010 5:16 AM
>> To: Interoperability Documentation Help; pfif at tridgell.net;
>> cifs-protocol at samba.org
>> Subject: more ms-dfsc.pdf questions
>>
>> Dear dochelp,
>>
>> The paragraph "2.2.1.3 Domain Name"
>> define domain name as
>> " Unless specified otherwise, a domain name MUST be a null-terminated Unicode character string
>> consisting of the name of a domain. This can be either a NetBIOS name or a fully qualified domain
>> name (FQDN), as specified in [MS-ADTS]."
>>
>> So when we have in "3.3.5.3 Receiving a DC Referral Request"
>>
>> " The domain name in the referral request MUST be either a domain in the current forest or a domain
>> in a trusted forest. The server MUST fail DC referral requests for other domain names with a
>> STATUS_INVALID_PARAMETER (0xC000000D) return code."
>>
>> We expect the client to request either FOOBAR (netbios domain) or foobar.demo.com (fqdn).
>>
>> But it turns out that windows XP at least is requesting \FOOBAR and
>> \foobar.demo.com when w7 and w2k8 are requestion FOOBAR and
>> foobar.demo.com
>>
>> Also in the same paragraph "The SpecialNameOffset field MUST be set to the offset in bytes from the beginning of the referral entry to the string that contains the domain name for the referral response."
>> It let me think that this field should contain FOOBAR or foobar.demo.com but it turns out that it's \FOOBAR or \foobar.demo.com that is returned (the example in the mails out dfs questions from Bill Wesse was also showing this).
>>
>> The same remark apply the ExpandedName that also present a '\'.
>>
>>
>> In this paragraph it stated that:
>> "The ExpandedNameOffset field MUST be set to the offset in bytes from the beginning of the referral entry to the first null-terminated DC Unicode string. Each DC name immediately follows its null-terminated predecessor without any padding. An implementation MUST use the value in the NumberOfExpandedNames field to determine how many names are present in the list at ExpandedNameOffset.
>> "
>> but in this doc:
>> "http://technet.microsoft.com/ru-ru/library/cc782417%28WS.10%29.aspx"
>> this point:
>>
>> "The client checks its domain cache for an existing domain controller referral for the Contoso.com domain. If this referral is in the cache, the client proceeds to step 5. If no domain controller referral is in the domain cache, the client connects to the IPC$ shared folder of the active domain controller in the context of the LocalSystem account and sends a domain controller referral request containing the appropriate domain name (Contoso.com). The domain controller returns the list of domain controllers in the Contoso.com domain. The domain controllers in the clients site are at the top of the list. If least-expensive target selection is enabled, domain controllers outside of the targets site are sorted by lowest cost. If same-site target selection is enabled, DFS ignores this setting and lists the remaining domain controllers in random order."
>>
>> Tells us that the same-site target or other parameters have an influence.
>>
>> Maybe the MS-DFSC needs to be updated ? Also where those parameters (same-site target, least-expensive, ...) are stored (in the DS or somewhere else).
>>
>> The next paragraph sates: "From the IP address of the client, determine the site of the client" what should happen is the client is not in a site (for instance if it has a static ip and the admin forgot to declare this subnet in one site) ?
>>
>> Regards.
>>
>> Matthieu.
>>
>>
>>
>>
>>
>>
>>
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