Ruckus DHCP Relay != Cisco/HP DHCP Relay

[mark_buteyn]

I'm working on configuring WLANs with vlan tagging.  My understanding of DHCP relay from my networking background is a way of relaying DHCP request between different vlans.  DHCP relay in the Ruckus world is a way of broadcast traffic management.  Can someone correct me if I'm wrong?

If I'm right, I'm running stuck.  I've trolled the forums for a while trying to find similar situations.  

DHCP server on vlan 10 and it has two scopes: main network: 10.0.0.0/16 (for vlan 10) and guest network: 10.1.0.0/16 (for vlan 20). I have an L3 switch that does the DHCP relay (using ip helper-address). Router is configured properly too.

I connect a laptop via wired connection to a port with a vlan assignment of 20  The laptop gets an IP address in the 10.1.0.0/16 subnet and all is well.  

I disconnect the wired and connect the wireless to a vlan 20 tagged WLAN and it doesn't get an IP address at all.  Wireshark shows no DHCP responses coming back.  

I configured the WLAN with Ruckus' DHCP relay per documentation and I get an address back in the 10.0.0.0/16 scope.

What doesn't make sense to me is if I have a WLAN with vlan tagging, shouldn't that be the same as plugging in a wired connection to a vlan tagged port?

[eizens_putnins]

 It looks really surprising. I would propose to turn on packet capturing on this AP and look on Wireshark capture.
As you can communicate with fixed IP on laptop, than WLAN is connected properly to VLAN.
As you are getting proper DHCP IP in same VLAN on same switch through port, than DHCP relay is also working properly.
May be you have client isolation on and it prevents receiving DHCP messages?
Capture traffic on AP and look on this capture, that it must become clear.

[eizens_putnins]

Hello, Mark,
You don't need  to set DHCP relay setting in Ruckus for WLANs, you may need it only if you have wired clients and DHCP server on multiple AP ports, configured with different subnets. Never needed it, so never used.
Otherwise Ruckus works as a bridge, and all DHCP relay setting must be done on wired side.

When you made capturing, it will be interesting what you found...

Regards,,
Eizens