Orbi RBR750 w/ 2 Satellites and Arris SB8200 modem assigning wrong IP to devices (192. To 172.)

---

KSKasia wrote:
router assigns some devices the 172.27 IP (or 169.) and that device won’t connect to the internet. How do I remedy this? I already reset both the modem and the Orbi and satellites and even renamed my network and changed passwords. Issue keeps coming back. Whenever a device is turned off or either assigns the correct IP address of 192. Or the wrong one 172. Help

---

There is a world of difference between a device having a private IP address https://en.wikipedia.org/wiki/Private_network  which always begins with 10, 127, or 192 and a link-local IP address https://en.wikipedia.org/wiki/Link-local_address beginning with 169 which is created by the device when it cannot get an IP address from the network.  These are totally different problems.

Does this happen to only certain devices or does it happen randomly to nearly every device at one time or another?

I suspect that there is a second DHCP server somewhere on the network that is giving out 172.27.x.x IP addresses.  DHCP is a mechanism that is designed to allow for redundancy. There can be any number of DHCP servers on a network. When a device broadcasts a request for an IP address, it will accept the first response that it gets (even by a microsecond.  first literally means first.)  In a corporate environment, this allows DHCP servers to be taken off-line for maintenance while keeping the network operating, and it is a major chore to keep all the DHCP servers in sync.

It is not trivial to find a rogue DHCP server.  Some speaker systems create their own network.

What I (personally) would do is hope there is a Windows or Linux computer on the network that exhibits this behavior.  Install Wireshark on the computer to capture the network.  Then deliberately do ipconfig/release and ipconfig/renew until an invalid IP appears and hope that the device that sent the invalid IP can identified from its hardware MAC address.