Mandatory DHCP

[jeustace]

Hi, has anyone turned on mandatory DHCP on an SSID?

I'm having problems with it.

If a client roams to a different AP to the one it originally connected to, the traffic isn't bridged to the LAN side of the "roamed to" AP. If you then disconnect and reconnect it works because the new AP has witnessed the DHCP exchange.

Meraki support have told me that the client should refresh DHCP on every roam but that's just not feasible surely?

Anyone else had any experiences to share? I have yet to witness ANY client refreshing DHCP on roaming.

[Raphael_L]

This has been changed in recent MR32.X code :

https://documentation.meraki.com/MR/Wi-Fi_Basics_and_Best_Practices/Roaming_Technologies

Mandatory DHCP + Fast roaming (802.11r)

This feature enhances client mobility by enabling support for Fast Roaming on SSIDs where Mandatory DHCP is enforced. Starting with firmware version MR 32.1.X, DHCP state information is now shared across APs, allowing seamless client transitions between APs without reinitiating DHCP requests.

Prior to MR32, client roaming to a new AP was required to send new DHCP request before traffic would be allowed. Even if the client had successfully obtained a DHCP lease from the previous AP, the new AP would block traffic until it saw another DHCP exchange.

[jeustace]

Well that didn't take long to sort out. 🤣 Thanks for the update!