In watching multiple videos and attfinishing a handful of webinars and classes, I noticed that practically everybody I seem to see just ever before have 1 DNS server. Some have actually even warned against using even more than one, but never really said why.

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So... at our company we have 4, from what I can tell. We aren"t a big agency (150ish employees, 2 places connected via an MPLS connection). Why would certainly we need or have 4? Is tright here any real reason for that? 

The 4 are all Domajor Controllers as well, one of which was decommissioned freshly yet reportedly still has actually DNS running on it?

I guess I"m just a tiny puzzled regarding why we"d need more than one. 


Best Answer

Jalapeno
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Rute675 Dec 22, 2014 at 15:56 UTC

Redundancy, plain and easy. In your situation, you have redundant DNS servers at both locations.


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Mace
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Doughnut
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Dec 22, 2014 at 15:56 UTC

At initially thought you do not need all that.


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Jalapeno
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Best Answer
Rute675 Dec 22, 2014 at 15:56 UTC

Redundancy, ordinary and basic. In your situation, you have actually redundant DNS servers at both areas.


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Jalapeno
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ebaker Dec 22, 2014 at 15:57 UTC

Redundancy and resource availability. It"s the exact same reason you have 4 domain controllers. If you have actually one and also it tanks, your ADVERTISEMENT framework is offline so user"s can"t authenticate, access resources, or even hit webperas.


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Mace
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hutchingsp Dec 22, 2014 at 15:57 UTC

2 is excellent, 3 is better, 4 won"t execute any type of damage however depends on the context i.e. 2 servers in 2 sites renders feeling, 4 servers in a single site might make sense yet sounds choose overkill.


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Ghost Chili
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dimforest
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Dec 22, 2014 at 16:12 UTC

Alright - just checking that we weren"t making a mistake. We"ve had countless DNS-related concerns in the last few months.


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Mace
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hutchingsp Dec 22, 2014 at 16:17 UTC

Keep in mind it does not issue if you have 1 or 4 if they"re misconfigured somehow :-)

It"s not really a black and also white question tbh as it could be completely valid or entirely uncrucial.


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Poblano
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ed88 Dec 22, 2014 at 17:10 UTC

It definitely will not perform any type of damage however you do need to make certain that they are all in sync via each other...if not then that might definitely reason DNS problems...


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Ghold Chili
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dimwoodland
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Dec 22, 2014 at 22:01 UTC

Can you be even more specific? 

Lastly, what around having actually multiple DHCP servers?


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Pure Capsaicin
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Scott Alan Miller Dec 22, 2014 at 22:59 UTC

DNS, if you have it, is primarily pretty essential. If you need DNS in general, you more than likely require it all of the time.


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Jalapeno
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mdpeterguy Dec 23, 2014 at 04:32 UTC

You need to pretty a lot have actually 2 of everything if your netjob-related is crucial to your netjob-related. 2 DNS, 2 ADVERTISEMENT, 2 DHCP, 2 routers, 2 firewall surfaces on and also on. Sounds choose you have actually 2 DNS servers at each location via is a pretty great setup. The firm I work-related for has 2 DNS/DHCP servers at each site (BlueCat Networks DNS/DHCP server)


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Mace
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hutchingsp Dec 23, 2014 at 09:39 UTC

brandondiener wrote:

Can you be even more specific? 

Lastly, what about having multiple DHCP servers?

You desire more than among each ideally.

DNS is a replicated system, through DHCP how much config you need to execute depends on your variation of Windows but you have the right to have multiple DHCP servers - it"s dubbed "separation scope".


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Anaheim
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Mike2764 Dec 25, 2014 at 20:16 UTC

hutchingsp wrote:

brandondiener wrote:

Can you be even more specific? 

Lastly, what about having multiple DHCP servers?

You want more than one of each ideally.

DNS is a replicated device, through DHCP exactly how a lot config you need to carry out relies on your variation of Windows but you can have multiple DHCP servers - it"s called "break-up scope".

With Server 2012 you don"t have to do split scope. You deserve to have 2 Server 2012 DHCP servers clustered, and they sync the DHCP database between them. So both servers are aware of each other and also can provide addresses to clients across the complete IP variety.
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Jalapeno
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Rich5442 Dec 27, 2014 at 18:33 UTC

I would certainly suggest having 2 physical DNS servers/DC"s and then have a 3rd that is virtual ideally via failover.

If you have actually a critical event occur within your server room or other environmental disaster you have actually a functional DC.

See more: Why I Want To Be Confirmed Essay, Why I Want To Be Confirmed

You could probably even acquire amethod through 1 physical and also 1 digital, but I would always recommfinish more than 1 no issue just how little the netoccupational. Too many kind of negative points deserve to happen through just 1.


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