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RBR40 and RBS40 generate different subnets for attached devices
I use RBR40/RBS40 mesh. Despite the fact that I have defined the subnet (192.168.0.x) for the LAN TCP/IP and directed to use Router as DHCP server with the starting and ending IP addresses within the...
I have found the "rogue" DHCP. My VoIP device had the internal DHCP server enabled. I turned it off, and the issue went away.
Thank you very much for your help.
There are several groups of IP addresses reserved for private networks:
https://en.wikipedia.org/wiki/Private_network
The most common reason for this is another DHCP server on the network. When devices broadcast a DHCP request, they accept the first response.
Is is always the same devices that get the unexpected IP address? Do they have anything in common (such as all being Sonos speaker units)? Do they sometimes get the expected IP address?
Testing this hypothesis is not trivial. This article presents some options:
https://serverfault.com/questions/8526/how-do-i-find-if-there-is-a-rogue-dhcp-server-on-my-network
Probably the quickest is to disable the router DHCP service temporariliy and see if devices continue to get IP address assignments.