DHCP Load Balancing vs. Failover/Hot Standby
Kurt Buff
Melvin Backus
I don’t know if it’s preferred but we’re setup with all our scopes split between the 2 dhcp servers. All the leases show up on both and they know which one issued them, etc., so they seems to be happy that way. I don’t know if there’s any benefit to failover instead. We chose this why back when we moved to 2012R2 and have had no issues. We don’t have nearly that many scopes but we do have a superscope setup to handle a subnet that required us to join two /24s.
My only complaint has been that Microsoft has yet to realize that when you put in a reservation it should go to both partners. We still have to script that to make it happen.
--
There are 10 kinds of people in the world...
those who understand binary and those who don't.
¯\_(ツ)_/¯
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Michael B. Smith
Yep, six of one, half-dozen of the other; as long as your routers and switches are properly configured.
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Belanger, Xavier B
Hi,
Melvin Backus wrote:
My only complaint has been that Microsoft has yet to realize that when you put in a reservation it should go to both partners. We still have to script that to make it happen.
I need to look at my archives but I should have a script that does this, plus another one that will output a text version of the configuration of each DHCP server to confirm that they are actually in sync.
Anyone interested, please reach out to me directly.
Sincerely,
--
Xavier Belanger
IT Security Architect | CISSP | Office of Information Security
University of North Carolina Wilmington
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Subject: RE: [ntsysadmin] DHCP Load Balancing vs. Failover/Hot Standby
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Gantry Zettler
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Rick McClure
Did you re-enable the secondary DHCP server?.....and just monitor the hell out of it?
Rick.
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Gantry Zettler
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Michael B. Smith
We spent a lot of time trying to ensure that everything the MSFT console would display, that our script also displayed:
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Miller Bonnie L.
We’ve been using DHCP failover for many years now and while it’s had its own quirks at times (mostly early when it was WS12 only) it generally works well, and replicating reservations is included. There are a few things that don’t replicate like server options but once you know what they are it’s easy to work with—from the quick MS overview I had years ago it’s generally those server-level config items vs anything at the scope level. We’ve even recently upgraded some of the failover servers one at a time while keeping it all online.
The one thing that can be a gotcha for some is that it ONLY works for true DHCP clients. It will not load balance if your devices are only BOOTP, which sounds a bit like it could possibly be the problem described below.
-Bonnie
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Melvin Backus
My apologies, I misspoke. It’s filters that don’t replicate, not reservations. Logically I suppose that might make some sense given that filters are a server object and not a scope object. Still a PITA to chase until you realize it. Scripting is easy enough, and I don’t know how many other folks actually use filters.
--
There are 10 kinds of people in the world...
those who understand binary and those who don't.
¯\_(ツ)_/¯
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Denes, Laszlo
Yeah that manual intervention or script to keep things clean is what is holding me back from doing it.
How is that working out for you… any issues… does it get ugly If script fails to run.. is it a github script or custom
Thank you in advance for your time.
Laszlo
Laszlo Denes
Technical Analyst Servers
Information Systems
t: ext. 214
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Denes, Laszlo
Isn’t that merely adding all required ip-helper addresses on the layer 3 switches
Thank you in advance for your time.
Laszlo
Laszlo Denes
Technical Analyst Servers
Information Systems
t: ext. 214
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Denes, Laszlo
Hi Xavier I would be interested for sure, but did not see a direct email for you.
Thank you in advance for your time.
Laszlo
Laszlo Denes
Technical Analyst Servers
Information Systems
t: ext. 214
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Michael B. Smith
Yes, and routers if need be.
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Melvin Backus
It’s trival. Just a couple of commands. I actually used to do it on a timed basis but then I realized I could tie it to the filter add events and run it only when somebody updated the filters.
Get-DhcpServerv4Filter -ComputerName sourcemachine | Add-DhcpServerv4Filter -ComputerName targetmachine -ErrorAction SilentlyContinue
All one line, watch for wrap
--
There are 10 kinds of people in the world...
those who understand binary and those who don't.
¯\_(ツ)_/¯
.
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Denes, Laszlo
Cheers for that
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