Hi AskPFEPlat readers. Tom Moser here. A question I get on a pretty frequent basis from my larger, multi-forest enterprise customers is:
“Do I need to add subnets from Forest A to Forest B so that clients find the correct DC across the trust?”
And here’s how I try to answer that question, usually with a lot of words, a little white boarding, and a lot of pointing. I thought, “this needs pictures…” so here you go.
If you’re in a hurry to get back to /r/sysadmin, the short answer is no. If you want to know why, keep reading. Then maybe cross post this for me there.
*** Point of Clarification ***
This post is about the a scenario where the subnets in the two forests do not overlap (i.e., client’s IP address from forest A is not covered by any subnet in forest B). This would typically occur in resource forest scenarios with separate networks. For example: federating via trust with Microsoft online services or a trust between a corporate forest and a perimeter forest. Everything you’re about to read below assumes that the client IP from Forest A is not covered by any subnet in Forest B.
In cases where the two forests have conflicting subnets (for example, 10.1.1.0/24 means site “Detroit” in Forest A, but means site “Siberia” in Forest B), there are additional considerations. We will cover these in a later post.
Where’s my DC?
First, let’s talk about how your workstation, or any domain member, finds a domain controller at startup. To demo this, I configured port mirroring on my VMs in Hyper-V and intercepted the entire network conversation on another VM. For the purposes of demonstration, I’ve filtered the traffic to just DNS, LDAP, and Netlogon responses.
At startup, the first thing a domain member needs to do is authenticate. Almost. Before that, it needs to find a (hopefully local) domain controller. It does this by sending a DNS query to its primary DNS server. The query is simply looking for an LDAP server in the DNS domain of the workstation. My client queried DC01 (primary DNS) for _ldap._tcp.dc._msdcs.corp.milt0r.com ( Figure 1 ).
Figure 1 - First DNS queries at start
The first frame shows the DNS query, and the second shows the response. In the response data, we get a list of all of the SRV records ( Figure 2 ). Examining the frame details for the response, we can see all of the DCs with an LDAP SRV record registered in the global SRV list. This is the list of all DCs in my forest that are configured to globally register SRV records.
Figure 2 - DNS Response Frame Details
Next, the client picks one of those “ARecord” entries and queries the hostname. Here ( Figure 3 ) it queries its DNS server for the IP address of dc04.corp.milt0r.com and receives a response of 10.2.1.11.
Figure 3 - DNS Query: Round 2
You can see that based only on that initial query for _ldap._tcp.dc._msdcs.corp.milt0r.com we’ve resolved an IP address for a DC that is (well, should be) hosting the LDAP service.
Anybody home?
Netlogon now has what it needs to contact the DC. Using the IP address it resolved, the client sends a UDP ping in the form of a UDP LDAP query to the DC ( Figure 4 ).
Figure 4 - UDP LDAP “Ping” Conversation
DC04 responds to the LDAP “ping” in the form of a Netlogon SAM Response. If no response is received, it tries another DC. The payload contains ( Figure 5 😞
Figure 5 - More Frame Details
Check that out. ClientSiteName . The response from the UDP LDAP query tells my client which site it (the client) belongs to. Now you know. That value ends up getting written under Netlogon’s parameters key in the registry on the client machine(HKLM\System\CurrentControlSet\Services\Netlogon\Parameters\DynamicSiteName).
But, we still aren’t connected to a local DC. That DcSiteName property indicates that DC04 is in CORPDR. We want a local DC. If you wanted to go way off in to the weeds here, you could enable Netlogon debug logging and look for MAILSLOT entries in the log. There you’d see ( Figure 6 😞
Figure 6 - Netlogon.log with debug level logging
It shows us right in the logs that DC04 isn’t a local DC and that it’s going to try to find a DC in a closer site. Immediately after that, we see another DNS query ( Figure 7 ). This query is for another LDAP SRV record, but this time it looks a little different:
Figure 7 - Site specific DNS query
Instead of querying for any DC as the service did at start, the service now performs a site specific query using _ldap._tcp. CORPHQ ._sites.dc._msdcs.corp.milt0r.com. DNS returns a response that contains the SRV records for all of the domain controllers in the CORPHQ site. The frame details for the DNS reply contains ( Figure 8 😞
Figure 8 - Site specific DNS reply - Frame Details
Each A Record entry contains info about an SRV record. Now we know that DC02 is hosting LDAP on 389. Next we would expect a DNS query for DC02 ( Figure 9 😞
Figure 9 - DNS Query for DC A Record
Based on the response, Netlogon tries the UDP LDAP query again, this time to 10.1.1.11 (in the log above). And there you have it. From this point on, any process using DCLocator or DsGetDcName should use the site specific queries.
But “how does that help you cross-forest” you ask? Great question.
Finding DCs Cross-Forest
I have a forest trust configured between corp.milt0r.com and dmz.milt0r.com . I’ve also got a stub zone configured on my primary DNS server pointing to dmz.milt0r.com. From my client, Win8, I’ll open cmd.exe and run nltest to find a DC in the other forest ( Figure 10 ).
Figure 10 – nltesting…
Examining the network trace shows some interesting information. When my machine started, it performed that generic query to the global SRV list. When I crossed my forest trust and needed to find a DC, it did this ( Figure 11 😞
Figure 11 - Cross-trust DNS Query – Site specific
The first query to the trusting forest performed a DNS query looking for _ldap._tcp. CORPHQ ._sites.dc._msdcs.dmz.milt0r.com. Weird. We don’t even know if that’s a valid site in dmz.milt0r.com… and according to that “Name Error” message in the response, it isn’t! Based on the information provided in the capture, we now know that the first DNS query for a DC in another forest will look for a DC in a site that matches the client’s site in its own forest. Since it didn’t find one, it falls back to the global list ( Figure 12 ).
Figure 12 - Cross-trust DNS Query – Non-site specific
This one returns a response. From there, we witness a similar behavior to what we saw in the local forest. A DNS query to the hostname we want to use, then one of the UDP LDAP “pings” ( Figure 13 ).
Figure 13 - A Record Query and LDAP Ping
And then the corresponding MAILSLOT entry in the Netlogon debug log ( Figure 14 ).
Figure 14 - More netlogon logs.
So how do I ensure that I find a DC across the trust in a “local” site or desired site?
By now, you’ve probably guessed it. You simply need to create a site in the trusting forest that has the same name as the site in the trusted forest. If I jump on to OLDDC01 in the DMZ forest and fire up Sites and Services, I can add a new site ( Figure 15 😞
Figure 15 - It's a 2003 DC, hence OLDDC01.
The site doesn’t need to actually contain any domain controllers. You’ll just want to ensure that it’s connected to a site that you want to service the authentications and LDAP queries. The rest will happen via automatic site coverage. DCs linked to empty sites recognize that the other site has no DCs and register SRV records there to ensure that clients find a “close enough” domain controller. When that happens, you’ll see a message from Netlogon like the one below ( Figure 16 ).
Figure 16 - Automatic Site Coverage event log message
And now when running that nltest command again, we observe:
Figure 17 - Cross-trust DNS Query - Site Specific and successful!
The first query we see ( Figure 17 ) is, once again, site specific…except this time it returns a successful response. Next, it queries the A record and finally performs the LDAP ping. From there authentication occurs against the site-specific foreign DC. By matching the site name, we’re able to help predict and control which DCs I will go to across the forest trust.
Conclusion
My hope is that by this point you have an understanding of how DCLocator works for finding DCs in the domain of the workstation and that you understand how to get it to find specific DCs across a forest trust. Long story short, you don’t need to go out and register all of your subnets in the trusting forest, but you do need to have site names that match, as well as a topology that matches how you’d like the traffic to flow between the two forests. You won’t want to place a matching site name off of some site that contains DCs but is poorly connected and unreliable.
Please keep in mind that caveat I mentioned at the beginning. This methodology works great when the subnet in Forest A doesn’t exist in Forest B. There could, however, be some unintended results and issues if conflicting subnet definitions exist. Watch for another post on that very soon.
Big thanks to fellow PFE Matt Reynolds for his assistance with this post and doing some labbing and confirmation around these topics. His contribution provided the info for the follow up post. Look for that in the next few weeks.
Thanks for reading and post any questions in the comments below!
Shouldn't the site name modifications be done in the *trusted* forest ? After all, it's here where the client's DNS requests, containing _ldap._tcp_.<trustingForestSite>._sites.dc_msdcs_.<trustedForestName>, will eventually land. Modifying the sites in the trusting forest will not achieve the objective, since the DNS servers in the trusting forest cannot answer queries ending in ...<trustedForestName>, but can only forward them to the DNS servers in the trusted forest, based on the stub zone/conditional forwarders/etc.
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First published on TechNet on May 05, 2013 Hi AskPFEPlat readers.
","body":"
First published on TechNet on May 05, 2013
\n
Hi AskPFEPlat readers. Tom Moser here. A question I get on a pretty frequent basis from my larger, multi-forest enterprise customers is:
\n
\n
\n
“Do I need to add subnets from Forest A to Forest B so that clients find the correct DC across the trust?”
\n
\n
\n
And here’s how I try to answer that question, usually with a lot of words, a little white boarding, and a lot of pointing. I thought, “this needs pictures…” so here you go.
\n
If you’re in a hurry to get back to /r/sysadmin, the short answer is no. If you want to know why, keep reading. Then maybe cross post this for me there.
\n
\n
*** Point of Clarification ***
\n
\n
This post is about the a scenario where the subnets in the two forests do not overlap (i.e., client’s IP address from forest A is not covered by any subnet in forest B). This would typically occur in resource forest scenarios with separate networks. For example: federating via trust with Microsoft online services or a trust between a corporate forest and a perimeter forest. Everything you’re about to read below assumes that the client IP from Forest A is not covered by any subnet in Forest B.
\n
\n
In cases where the two forests have conflicting subnets (for example, 10.1.1.0/24 means site “Detroit” in Forest A, but means site “Siberia” in Forest B), there are additional considerations. We will cover these in a later post.
\n
\n
Where’s my DC?
\n
\n
First, let’s talk about how your workstation, or any domain member, finds a domain controller at startup. To demo this, I configured port mirroring on my VMs in Hyper-V and intercepted the entire network conversation on another VM. For the purposes of demonstration, I’ve filtered the traffic to just DNS, LDAP, and Netlogon responses.
\n
\n
At startup, the first thing a domain member needs to do is authenticate. Almost. Before that, it needs to find a (hopefully local) domain controller. It does this by sending a DNS query to its primary DNS server. The query is simply looking for an LDAP server in the DNS domain of the workstation. My client queried DC01 (primary DNS) for _ldap._tcp.dc._msdcs.corp.milt0r.com ( Figure 1 ).
\n
\n
\n
Figure 1 - First DNS queries at start
\n
\n
The first frame shows the DNS query, and the second shows the response. In the response data, we get a list of all of the SRV records ( Figure 2 ). Examining the frame details for the response, we can see all of the DCs with an LDAP SRV record registered in the global SRV list. This is the list of all DCs in my forest that are configured to globally register SRV records.
\n
\n
\n
Figure 2 - DNS Response Frame Details
\n
\n
Next, the client picks one of those “ARecord” entries and queries the hostname. Here ( Figure 3 ) it queries its DNS server for the IP address of dc04.corp.milt0r.com and receives a response of 10.2.1.11.
\n
\n
\n
Figure 3 - DNS Query: Round 2
\n
\n
You can see that based only on that initial query for _ldap._tcp.dc._msdcs.corp.milt0r.com we’ve resolved an IP address for a DC that is (well, should be) hosting the LDAP service.
\n
\n
Anybody home?
\n
\n
Netlogon now has what it needs to contact the DC. Using the IP address it resolved, the client sends a UDP ping in the form of a UDP LDAP query to the DC ( Figure 4 ).
\n
\n
\n
Figure 4 - UDP LDAP “Ping” Conversation
\n
\n
DC04 responds to the LDAP “ping” in the form of a Netlogon SAM Response. If no response is received, it tries another DC. The payload contains ( Figure 5 😞
\n
\n
\n
Figure 5 - More Frame Details
\n
\n
Check that out. ClientSiteName . The response from the UDP LDAP query tells my client which site it (the client) belongs to. Now you know. That value ends up getting written under Netlogon’s parameters key in the registry on the client machine(HKLM\\System\\CurrentControlSet\\Services\\Netlogon\\Parameters\\DynamicSiteName).
\n
\n
But, we still aren’t connected to a local DC. That DcSiteName property indicates that DC04 is in CORPDR. We want a local DC. If you wanted to go way off in to the weeds here, you could enable Netlogon debug logging and look for MAILSLOT entries in the log. There you’d see ( Figure 6 😞
\n
\n
\n
Figure 6 - Netlogon.log with debug level logging
\n
\n
It shows us right in the logs that DC04 isn’t a local DC and that it’s going to try to find a DC in a closer site. Immediately after that, we see another DNS query ( Figure 7 ). This query is for another LDAP SRV record, but this time it looks a little different:
\n
\n
\n
Figure 7 - Site specific DNS query
\n
\n
Instead of querying for any DC as the service did at start, the service now performs a site specific query using _ldap._tcp. CORPHQ ._sites.dc._msdcs.corp.milt0r.com. DNS returns a response that contains the SRV records for all of the domain controllers in the CORPHQ site. The frame details for the DNS reply contains ( Figure 8 😞
\n
\n
\n
Figure 8 - Site specific DNS reply - Frame Details
\n
\n
Each A Record entry contains info about an SRV record. Now we know that DC02 is hosting LDAP on 389. Next we would expect a DNS query for DC02 ( Figure 9 😞
\n
\n
\n
Figure 9 - DNS Query for DC A Record
\n
\n
Based on the response, Netlogon tries the UDP LDAP query again, this time to 10.1.1.11 (in the log above). And there you have it. From this point on, any process using DCLocator or DsGetDcName should use the site specific queries.
\n
\n
But “how does that help you cross-forest” you ask? Great question.
\n
\n
Finding DCs Cross-Forest
\n
I have a forest trust configured between corp.milt0r.com and dmz.milt0r.com . I’ve also got a stub zone configured on my primary DNS server pointing to dmz.milt0r.com. From my client, Win8, I’ll open cmd.exe and run nltest to find a DC in the other forest ( Figure 10 ).
\n
\n
\n
Figure 10 – nltesting…
\n
\n
Examining the network trace shows some interesting information. When my machine started, it performed that generic query to the global SRV list. When I crossed my forest trust and needed to find a DC, it did this ( Figure 11 😞
\n
\n
\n
Figure 11 - Cross-trust DNS Query – Site specific
\n
\n
The first query to the trusting forest performed a DNS query looking for _ldap._tcp. CORPHQ ._sites.dc._msdcs.dmz.milt0r.com. Weird. We don’t even know if that’s a valid site in dmz.milt0r.com… and according to that “Name Error” message in the response, it isn’t! Based on the information provided in the capture, we now know that the first DNS query for a DC in another forest will look for a DC in a site that matches the client’s site in its own forest. Since it didn’t find one, it falls back to the global list ( Figure 12 ).
\n
\n
\n
Figure 12 - Cross-trust DNS Query – Non-site specific
\n
\n
This one returns a response. From there, we witness a similar behavior to what we saw in the local forest. A DNS query to the hostname we want to use, then one of the UDP LDAP “pings” ( Figure 13 ).
\n
\n
\n
Figure 13 - A Record Query and LDAP Ping
\n
\n
And then the corresponding MAILSLOT entry in the Netlogon debug log ( Figure 14 ).
\n
\n
\n
Figure 14 - More netlogon logs.
\n
\n
So how do I ensure that I find a DC across the trust in a “local” site or desired site?
\n
\n
By now, you’ve probably guessed it. You simply need to create a site in the trusting forest that has the same name as the site in the trusted forest. If I jump on to OLDDC01 in the DMZ forest and fire up Sites and Services, I can add a new site ( Figure 15 😞
\n
\n
\n
Figure 15 - It's a 2003 DC, hence OLDDC01.
\n
\n
The site doesn’t need to actually contain any domain controllers. You’ll just want to ensure that it’s connected to a site that you want to service the authentications and LDAP queries. The rest will happen via automatic site coverage. DCs linked to empty sites recognize that the other site has no DCs and register SRV records there to ensure that clients find a “close enough” domain controller. When that happens, you’ll see a message from Netlogon like the one below ( Figure 16 ).
\n
\n
\n
Figure 16 - Automatic Site Coverage event log message
\n
\n
And now when running that nltest command again, we observe:
\n
\n
\n
Figure 17 - Cross-trust DNS Query - Site Specific and successful!
\n
\n
The first query we see ( Figure 17 ) is, once again, site specific…except this time it returns a successful response. Next, it queries the A record and finally performs the LDAP ping. From there authentication occurs against the site-specific foreign DC. By matching the site name, we’re able to help predict and control which DCs I will go to across the forest trust.
\n
\n
Conclusion
\n
\n
My hope is that by this point you have an understanding of how DCLocator works for finding DCs in the domain of the workstation and that you understand how to get it to find specific DCs across a forest trust. Long story short, you don’t need to go out and register all of your subnets in the trusting forest, but you do need to have site names that match, as well as a topology that matches how you’d like the traffic to flow between the two forests. You won’t want to place a matching site name off of some site that contains DCs but is poorly connected and unreliable.
\n
\n
Please keep in mind that caveat I mentioned at the beginning. This methodology works great when the subnet in Forest A doesn’t exist in Forest B. There could, however, be some unintended results and issues if conflicting subnet definitions exist. Watch for another post on that very soon.
\n
\n
Big thanks to fellow PFE Matt Reynolds for his assistance with this post and doing some labbing and confirmation around these topics. His contribution provided the info for the follow up post. Look for that in the next few weeks.
\n
\n
Thanks for reading and post any questions in the comments below!
\n
\n
- Tom \"I'm gonna need a 10-20 on that DC\" Moser
\n
@Milt0r
","body@stringLength":"20333","rawBody":"
First published on TechNet on May 05, 2013
\n
Hi AskPFEPlat readers. Tom Moser here. A question I get on a pretty frequent basis from my larger, multi-forest enterprise customers is:
\n
\n
\n
“Do I need to add subnets from Forest A to Forest B so that clients find the correct DC across the trust?”
\n
\n
\n
And here’s how I try to answer that question, usually with a lot of words, a little white boarding, and a lot of pointing. I thought, “this needs pictures…” so here you go.
\n
If you’re in a hurry to get back to /r/sysadmin, the short answer is no. If you want to know why, keep reading. Then maybe cross post this for me there.
\n
\n
*** Point of Clarification ***
\n
\n
This post is about the a scenario where the subnets in the two forests do not overlap (i.e., client’s IP address from forest A is not covered by any subnet in forest B). This would typically occur in resource forest scenarios with separate networks. For example: federating via trust with Microsoft online services or a trust between a corporate forest and a perimeter forest. Everything you’re about to read below assumes that the client IP from Forest A is not covered by any subnet in Forest B.
\n
\n
In cases where the two forests have conflicting subnets (for example, 10.1.1.0/24 means site “Detroit” in Forest A, but means site “Siberia” in Forest B), there are additional considerations. We will cover these in a later post.
\n
\n
Where’s my DC?
\n
\n
First, let’s talk about how your workstation, or any domain member, finds a domain controller at startup. To demo this, I configured port mirroring on my VMs in Hyper-V and intercepted the entire network conversation on another VM. For the purposes of demonstration, I’ve filtered the traffic to just DNS, LDAP, and Netlogon responses.
\n
\n
At startup, the first thing a domain member needs to do is authenticate. Almost. Before that, it needs to find a (hopefully local) domain controller. It does this by sending a DNS query to its primary DNS server. The query is simply looking for an LDAP server in the DNS domain of the workstation. My client queried DC01 (primary DNS) for _ldap._tcp.dc._msdcs.corp.milt0r.com ( Figure 1 ).
\n
\n
\n
Figure 1 - First DNS queries at start
\n
\n
The first frame shows the DNS query, and the second shows the response. In the response data, we get a list of all of the SRV records ( Figure 2 ). Examining the frame details for the response, we can see all of the DCs with an LDAP SRV record registered in the global SRV list. This is the list of all DCs in my forest that are configured to globally register SRV records.
\n
\n
\n
Figure 2 - DNS Response Frame Details
\n
\n
Next, the client picks one of those “ARecord” entries and queries the hostname. Here ( Figure 3 ) it queries its DNS server for the IP address of dc04.corp.milt0r.com and receives a response of 10.2.1.11.
\n
\n
\n
Figure 3 - DNS Query: Round 2
\n
\n
You can see that based only on that initial query for _ldap._tcp.dc._msdcs.corp.milt0r.com we’ve resolved an IP address for a DC that is (well, should be) hosting the LDAP service.
\n
\n
Anybody home?
\n
\n
Netlogon now has what it needs to contact the DC. Using the IP address it resolved, the client sends a UDP ping in the form of a UDP LDAP query to the DC ( Figure 4 ).
\n
\n
\n
Figure 4 - UDP LDAP “Ping” Conversation
\n
\n
DC04 responds to the LDAP “ping” in the form of a Netlogon SAM Response. If no response is received, it tries another DC. The payload contains ( Figure 5 😞
\n
\n
\n
Figure 5 - More Frame Details
\n
\n
Check that out. ClientSiteName . The response from the UDP LDAP query tells my client which site it (the client) belongs to. Now you know. That value ends up getting written under Netlogon’s parameters key in the registry on the client machine(HKLM\\System\\CurrentControlSet\\Services\\Netlogon\\Parameters\\DynamicSiteName).
\n
\n
But, we still aren’t connected to a local DC. That DcSiteName property indicates that DC04 is in CORPDR. We want a local DC. If you wanted to go way off in to the weeds here, you could enable Netlogon debug logging and look for MAILSLOT entries in the log. There you’d see ( Figure 6 😞
\n
\n
\n
Figure 6 - Netlogon.log with debug level logging
\n
\n
It shows us right in the logs that DC04 isn’t a local DC and that it’s going to try to find a DC in a closer site. Immediately after that, we see another DNS query ( Figure 7 ). This query is for another LDAP SRV record, but this time it looks a little different:
\n
\n
\n
Figure 7 - Site specific DNS query
\n
\n
Instead of querying for any DC as the service did at start, the service now performs a site specific query using _ldap._tcp. CORPHQ ._sites.dc._msdcs.corp.milt0r.com. DNS returns a response that contains the SRV records for all of the domain controllers in the CORPHQ site. The frame details for the DNS reply contains ( Figure 8 😞
\n
\n
\n
Figure 8 - Site specific DNS reply - Frame Details
\n
\n
Each A Record entry contains info about an SRV record. Now we know that DC02 is hosting LDAP on 389. Next we would expect a DNS query for DC02 ( Figure 9 😞
\n
\n
\n
Figure 9 - DNS Query for DC A Record
\n
\n
Based on the response, Netlogon tries the UDP LDAP query again, this time to 10.1.1.11 (in the log above). And there you have it. From this point on, any process using DCLocator or DsGetDcName should use the site specific queries.
\n
\n
But “how does that help you cross-forest” you ask? Great question.
\n
\n
Finding DCs Cross-Forest
\n
I have a forest trust configured between corp.milt0r.com and dmz.milt0r.com . I’ve also got a stub zone configured on my primary DNS server pointing to dmz.milt0r.com. From my client, Win8, I’ll open cmd.exe and run nltest to find a DC in the other forest ( Figure 10 ).
\n
\n
\n
Figure 10 – nltesting…
\n
\n
Examining the network trace shows some interesting information. When my machine started, it performed that generic query to the global SRV list. When I crossed my forest trust and needed to find a DC, it did this ( Figure 11 😞
\n
\n
\n
Figure 11 - Cross-trust DNS Query – Site specific
\n
\n
The first query to the trusting forest performed a DNS query looking for _ldap._tcp. CORPHQ ._sites.dc._msdcs.dmz.milt0r.com. Weird. We don’t even know if that’s a valid site in dmz.milt0r.com… and according to that “Name Error” message in the response, it isn’t! Based on the information provided in the capture, we now know that the first DNS query for a DC in another forest will look for a DC in a site that matches the client’s site in its own forest. Since it didn’t find one, it falls back to the global list ( Figure 12 ).
\n
\n
\n
Figure 12 - Cross-trust DNS Query – Non-site specific
\n
\n
This one returns a response. From there, we witness a similar behavior to what we saw in the local forest. A DNS query to the hostname we want to use, then one of the UDP LDAP “pings” ( Figure 13 ).
\n
\n
\n
Figure 13 - A Record Query and LDAP Ping
\n
\n
And then the corresponding MAILSLOT entry in the Netlogon debug log ( Figure 14 ).
\n
\n
\n
Figure 14 - More netlogon logs.
\n
\n
So how do I ensure that I find a DC across the trust in a “local” site or desired site?
\n
\n
By now, you’ve probably guessed it. You simply need to create a site in the trusting forest that has the same name as the site in the trusted forest. If I jump on to OLDDC01 in the DMZ forest and fire up Sites and Services, I can add a new site ( Figure 15 😞
\n
\n
\n
Figure 15 - It's a 2003 DC, hence OLDDC01.
\n
\n
The site doesn’t need to actually contain any domain controllers. You’ll just want to ensure that it’s connected to a site that you want to service the authentications and LDAP queries. The rest will happen via automatic site coverage. DCs linked to empty sites recognize that the other site has no DCs and register SRV records there to ensure that clients find a “close enough” domain controller. When that happens, you’ll see a message from Netlogon like the one below ( Figure 16 ).
\n
\n
\n
Figure 16 - Automatic Site Coverage event log message
\n
\n
And now when running that nltest command again, we observe:
\n
\n
\n
Figure 17 - Cross-trust DNS Query - Site Specific and successful!
\n
\n
The first query we see ( Figure 17 ) is, once again, site specific…except this time it returns a successful response. Next, it queries the A record and finally performs the LDAP ping. From there authentication occurs against the site-specific foreign DC. By matching the site name, we’re able to help predict and control which DCs I will go to across the forest trust.
\n
\n
Conclusion
\n
\n
My hope is that by this point you have an understanding of how DCLocator works for finding DCs in the domain of the workstation and that you understand how to get it to find specific DCs across a forest trust. Long story short, you don’t need to go out and register all of your subnets in the trusting forest, but you do need to have site names that match, as well as a topology that matches how you’d like the traffic to flow between the two forests. You won’t want to place a matching site name off of some site that contains DCs but is poorly connected and unreliable.
\n
\n
Please keep in mind that caveat I mentioned at the beginning. This methodology works great when the subnet in Forest A doesn’t exist in Forest B. There could, however, be some unintended results and issues if conflicting subnet definitions exist. Watch for another post on that very soon.
\n
\n
Big thanks to fellow PFE Matt Reynolds for his assistance with this post and doing some labbing and confirmation around these topics. His contribution provided the info for the follow up post. Look for that in the next few weeks.
\n
\n
Thanks for reading and post any questions in the comments below!
First published on TechNet on May 05, 2013 Hi AskPFEPlat readers.
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