DHCP hot standby question
Denes, Laszlo
Hello Everyone,
Theoretically having 2 DHCP servers that each have a scope(s) and point to each other for hot-standby failover. So server 1 has the scope 10.x.x.x and points to server 2 as the standby partner and server 2 has the scope 172.x.x.x. and points to server 1 as the hot standby partner. So if server 1 goes down its 10.x.x.x scope comes up on server 2 and if server 2 goes down then its 172.x.x.x. scope comes up on server 1. So this way all scopes have a live DHCP server and a hot standby partner but only if they go down, i.e. not load balance mode. Any special gotcha’s if we try that, i.e. is it as easy as it seems? LOL! Cheers
Many thanks in advance for your time.
Regards,
Laszlo
Laszlo Denes
Technical Analyst Servers
Information Systems
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Sent: Tuesday, February 27, 2024 2:54:06 PM
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Cc: Denes, Laszlo <lde...@torontograce.org>
Subject: [ntsysadmin] DHCP hot standby question
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Philip Elder
It’s really that easy. The root folder icon in DHCP Management will change to indicate a failover relationship is in play.
Both active and passive should have the entirety of the DHCP database on them at any given time.
You can keep both partners in DHCP Management to keep an eye on them.
Down the road, migrating is really easy too.
Philip Elder MCTS
Senior Technical Architect
Microsoft High Availability MVP
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From: ntsys...@googlegroups.com <ntsys...@googlegroups.com>
On Behalf Of Denes, Laszlo
Sent: Tuesday, February 27, 2024 12:54
To: ntsys...@googlegroups.com
Cc: Denes, Laszlo <lde...@torontograce.org>
Subject: [ntsysadmin] DHCP hot standby question
Hello Everyone,
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Henry Awad
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Philip Elder
I don’t like split scenarios in a recovery situation no matter what service or workload we’re talking about.
DHCP? Go 100% Active/Passive it just works. BTDT
* Plus we’re not having to manage those split scopes.
FSMO Roles? Put them all on one DC. BTDT
Time? Put it on the PDCe and make all other DCs secondary to it BTDT
One stop makes recovery so much more simple if there’s a blotto situation.
Philip Elder MCTS
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Microsoft High Availability MVP
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Henry Awad
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Philip Elder
We’ve had situations where the active or the passive partner in a DHCP failover partnership failed. There were no issues and rebuilding the failed partner and getting failover up and running again same.
It’s more of a simplicity thing for me (KISS). Active/Passive is simpler to manage than a split scope setup would be IMO.
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Denes, Laszlo
Amazing cheers for that
Thank you in advance for your time.
Laszlo
Laszlo Denes
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Michael B. Smith
And just a fun fact here – you can export your DHCP configuration to text files for backup – and you can recover from those text files to another server.
Simplifies DR situations enormously…
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Kurt Buff
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Denes, Laszlo
Yeah regular backups here as well
Thank you in advance for your time.
Laszlo
Laszlo Denes
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Exceptional and compassionate care for all.
Denes, Laszlo
SO I tested and setup (thanks for tip again to turn off DHCP service to force failover and it worked great) failover from one server (has all scopes) to another server which now acts as hot standby partner to become active if source DHCP stops leasing for default 1 hour. I went with default values. I can see all scopes replicated with lease information etc. on the standby partner. It works. The only oddity is a yellow triangle with exclamation mark IPv4 which normally indicates 90% + scope lease full but I checked stats on each of the scopes and none of them are even close to be being that full. Thoughts?
It shows on both DHCP servers but only if I expan the IPv4 which is green otherwise
Wright, John M
At the link below, someone with a similar problem resolved it by deactivating a scope, then re-activating it. A reply in the thread also lists two other possibilities.
Blue Exclamation MArk on DHCP IPv4 scope - Microsoft Q&A
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Subject: [ntsysadmin] DHCP hot standby question
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Henry Awad
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Denes, Laszlo
Fantastic will try that. Cheers for fast answer 😊
Thank you in advance for your time.
Laszlo
Laszlo Denes
Technical Analyst Servers
Information Systems
t: ext. 214
Denes, Laszlo
Yeah 1 wireless scope is 92% right now but that will clear once people go home
Cheers again for insight
Thank you in advance for your time.
Laszlo
Laszlo Denes
Technical Analyst Servers
Information Systems
t: ext. 214
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Jim Behning
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