Dual, backup DHCP servers, one went down, workstations still got 169.x addys..?

markm75 · 02-23-2007, 08:37 PM

Here is my domain config: Two DCs, a few member servers.. a GC is set on both DCs. Both of these DCs act as DNS/DHCP servers, providing fault tolerance if one server is down/off.

Earlier today we had one of them offline.

A brand new workstation was brought out of its box today, connected to the wall.

It failed to find an IP address.. went into 169.x low connectivity mode.

Similarly, existing workstations (i'm assuming ones who had ip addresses from the secondary, down, DHCP server) that were working fine, if repaired the connection or logged off and back on.. could not then attain an ip address.

Shouldnt this fault tolerant situation still allow for the workstations to retrieve an IP address from the other DHPC, if the other one goes down?

I really was at a loss as to why the redundancy wasnt working (no error logs either)...

Thanks for any help.

whardman · 02-24-2007, 06:32 AM

Did you make sure to authorize both servers? It sounds like only one server was authorized.

markm75 · 02-24-2007, 01:27 PM

Quote:

Originally Posted by whardman

Did you make sure to authorize both servers? It sounds like only one server was authorized.

Yep they are both authorized and have worked as such in the past too..

I'm not quite doing the full 80/20 rule.. more like 50/50, but this shouldnt matter i dont think...

There is also no other rougue DHCPs on the network either.

02-23-2007, 08:37 PM	#1 (permalink)
markm75 Registered User Join Date: Jan 2007 Location: Western PA Posts: 383 OS: Vista x64	Dual, backup DHCP servers, one went down, workstations still got 169.x addys..? Here is my domain config: Two DCs, a few member servers.. a GC is set on both DCs. Both of these DCs act as DNS/DHCP servers, providing fault tolerance if one server is down/off. Earlier today we had one of them offline. A brand new workstation was brought out of its box today, connected to the wall. It failed to find an IP address.. went into 169.x low connectivity mode. Similarly, existing workstations (i'm assuming ones who had ip addresses from the secondary, down, DHCP server) that were working fine, if repaired the connection or logged off and back on.. could not then attain an ip address. Shouldnt this fault tolerant situation still allow for the workstations to retrieve an IP address from the other DHPC, if the other one goes down? I really was at a loss as to why the redundancy wasnt working (no error logs either)... Thanks for any help.

02-24-2007, 06:32 AM	#2 (permalink)
whardman Registered User Join Date: Jun 2006 Location: Cincinnati, Ohio Posts: 617 OS: Windows XP My System	Did you make sure to authorize both servers? It sounds like only one server was authorized.