We know how difficult it can be to evaluate Wi-Fi vendors, so we created this helpful Wi-Fi Buyer's Guide to help you find the Wi-Fi vendor that's right for your business! Download the guide and get started on our checklist today!
Solved
Question about creating a DNS load balance between domain controllers
Posted on 2012-12-29
Hi,
A small background before my question :) -
I had a need to create a load balance service name between all the domain controllers, i know i could use the default domain name instead, but it had connections to other servers except for the domain controllers.
So....
since i can't create the same multiple dns host to multiple servers i created a new subdomain and had all the domain controller's IP name SAME AS PARENT...so all would get the same DNS name of the new subdomain, hence creating a DNS Load Balance.
Here's my question though, how does it work? is it round robin? who answers first? the dc the computer is connected to or the DNS the computer is connected to?
AND the most important factor what if one of the domain controllers isn't available, will the be a timeout? or will the query never reach it in the first place?
A small background before my question :) -
I had a need to create a load balance service name between all the domain controllers, i know i could use the default domain name instead, but it had connections to other servers except for the domain controllers.
So....
since i can't create the same multiple dns host to multiple servers i created a new subdomain and had all the domain controller's IP name SAME AS PARENT...so all would get the same DNS name of the new subdomain, hence creating a DNS Load Balance.
Here's my question though, how does it work? is it round robin? who answers first? the dc the computer is connected to or the DNS the computer is connected to?
AND the most important factor what if one of the domain controllers isn't available, will the be a timeout? or will the query never reach it in the first place?
[X]
Welcome to Experts Exchange
Add your voice to the tech community where 5M+ people just like you are talking about what matters.
- Help others & share knowledge
- Earn cash & points
- Learn & ask questions
-
4
2
7 Comments
Active 7 days ago
If all your DC's are running DNS then all you need to do is list all of he DC's IP addresses in the NIC cards DNS settings on all machines. Windows will take care of the rest. No need for ANY load balancing, round robbins or square ones.
I didn't understand how this will create a load balance?
my need is to ping a name for example (dns.company.com) and have a redundancy (perhaps i should have used that therm instead of the load balance since it explains my needs better) between all domain controllers.
my need is to ping a name for example (dns.company.com) and have a redundancy (perhaps i should have used that therm instead of the load balance since it explains my needs better) between all domain controllers.
I have several applications that connect to Active Directory using LDAP directly to a Domain controller server, i don't want to give them the name of 1 domain controller since if it's down then the service is down, so....i want to create a DNS alias name to hold behind it all available DC's
Active 1 day ago
I'll get the easy part out of the way first:
To answer the question, there's no true load-balancing mechanism built into DNS. Round-robin DNS does load balancing only on the most basic level; it doesn't care whether a given server is down and will return its IP address anyway. Network Load Balancing (NLB) is outage-aware, but I can't think of a way to make it work in this scenario. If those apps that you're running are AD-aware, they should be able to use AD's built-in mechanisms to locate a DC that's running. Have you actually experienced problems with them?
Here's my question though, how does it work? is it round robin? who answers first? the dc the computer is connected to or the DNS the computer is connected to?Yes, it's round-robin by default. You can disable round-robin in the properties pages of the DNS servers (under the Advanced tab, I believe), but there's typically no reason to do this. So the first time a DNS server is queried for that name, it'll return the IP address of the first corresponding host record. The second time it's queried, it'll return the second one, etc. It should be mentioned that you won't see this exact behavior on a client. Multiple queries for the same name from a single client will return the same IP address for a while, because the client will have that address in its resolver cache and won't actually query a DNS server until the cached record expires or the entire cache is flushed.
i know i could use the default domain name instead, but it had connections to other servers except for the domain controllers.Are you saying you've got blank host records in DNS (host records with the name "same as parent folder") referring to machines other than domain controllers? If so, that's a problem. Those records are used by domain members to locate a DC, and they shouldn't ever refer to anything but DCs.
To answer the question, there's no true load-balancing mechanism built into DNS. Round-robin DNS does load balancing only on the most basic level; it doesn't care whether a given server is down and will return its IP address anyway. Network Load Balancing (NLB) is outage-aware, but I can't think of a way to make it work in this scenario. If those apps that you're running are AD-aware, they should be able to use AD's built-in mechanisms to locate a DC that's running. Have you actually experienced problems with them?
Featured Post
Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!
Learn how Concerto can help you.
Question has a verified solution.
If you are experiencing a similar issue, please ask a related question
Always backup Domain, SYSVOL etc.using processes according to Microsoft Best Practices. This is meant as a disaster recovery process for small environments that did not implement backup processes and did not run a secondary domain controller that ne…
Microsoft Office 365 is a subscriptions based service which includes services like Exchange Online and Skype for business Online. These services integrate with Microsoft's online version of Active Directory called Azure Active Directory.
This tutorial will walk an individual through the process of transferring the five major, necessary Active Directory Roles, commonly referred to as the FSMO roles from a Windows Server 2008 domain controller to a Windows Server 2012 domain controlle…
Attackers love to prey on accounts that have privileges.
Reducing privileged accounts and protecting privileged accounts therefore is paramount. Users, groups, and service accounts need to be protected to help protect the entire Active Directory …
Suggested Courses
Course of the Month9 days, 16 hours left to enroll
610 members asked questions and received personalized solutions in the past 7 days.
Join the community of 500,000 technology professionals and ask your questions.