After installing Wireless AP (Non-Meraki but still Cisco) LAN clients no longer can connect hard wired through network.. They get a DHCP address that I didnt configure on a vlan that I didnt create. (10.55.x.x) Gateway/DNS shows up as 10.128.128.128)
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If you set your LAN clients as static IP can they get out? What happens if you go to wired.meraki.com, will it load the configuration page of the MX?
It sounds very much like you have a Rogue DHCP server on that VLAN. I'd take a packet capture on one of the ports on that VLAN to see what's sending out DHCP offers, find the port that the client is connected to and disable this port.
You can also attempt the above troubleshooting too.
Is this "Wireless AP" that you connected also a "router"? I bet it is running a DHCP server, Try checking its config page.
I did check the WLC and it has a dhcp scope set but only for the wireless vlan. Not the config showing on the problem clients
@TM_1 Glad you got to the bottom of it!
That behavior sounds like when you have an MR access point running in NAT mode with Meraki DHCP, where clients are isolated from one another and get a seemingly random 10.x.x.x address, with a default gateway and DNS server of 10.128.128.128. Cannot tell what's really going on here without a network diagram, not sure we understand yet how things are connected. Are you saying you connected up an Aironet AP, and somehow afterwards wired clients cannot get out? Have you opened a ticket with Meraki Support to assist?