DHCP failover setup different IP offering with 2 helper address

[Alp Eren Kose]

Hello,

We have setup a DHCP failover configuration, with Wireless LAN Controllers
having multiple ip-helper-address statements. The controllers are Cisco and
Aruba branded. As I understand it, Controllers relay DHCP discover messages
to both DHCP servers, however sometimes we see different IP addresses are
OFFERED for the same request by both DHCP servers. Is it the normal
behavior?

Could you also point some documentation that I can read to understand how
exactly failover works in ISC DHCP version 4.2.8? Especially how multiple
discovery and request packets are handled from multiple ip-helper address
statements.

Note: Please forgive me if it has been asked before or is really a basic
question. I did have a quick look and did not come up with an answer, I
wouldn't be posting without more search if it wasn't urgent.

Thanks in advance.
Alp
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