Wireless Access

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Occasional Contributor II
Posts: 13
Registered: ‎02-01-2013

Multiple WLAN w/seperate DHCP Scopes

I have two wlans each configured with seperate vlan id, recently clients connecting to one of the wlans which has some interconnectivity to the internal LAN are not getting dhcp addresses from the scope configured on the controller but rather their dhcp requests are making their way to the domain controller and getting an address from a scope configured there. In what scenario would these broadcast requests not be handled by the controller and forward onward and how can i prevent this from happening?

Guru Elite
Posts: 8,641
Registered: ‎09-08-2010

Re: Multiple WLAN w/seperate DHCP Scopes

Do you have layer 3 interfaces for those VLANs on your controller?


Tim Cappalli | Aruba Security TME
@timcappalli | timcappalli.me | ACMX #367 / ACCX #480
MVP
Posts: 4,301
Registered: ‎07-20-2011

Re: Multiple WLAN w/seperate DHCP Scopes

 

Run the following :

 

show  running-config | begin gigabit 

 

And make sure those VLANs are trusted on the trunks going back to the uplink switch and it also matches the VLANs on the switchport trunk allowed vlans 

 

Also do a show trunk and a show interface brief to confirm that these are up and running.

 

 

 

 

 

 

Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
Occasional Contributor II
Posts: 13
Registered: ‎02-01-2013

Re: Multiple WLAN w/seperate DHCP Scopes

Yes for the problematic wlan not handing out the proper ip the configuration is ..port gig 1/0 connects to a dmz switch which then connects to the firewall port serving as the default router for the wlan, on this dmz switch is another connection to one of the two server switches this is how the dhcp requests are being forwarded to the domain controller however i need this connection as my inbound mail server utilizes this path. This was working within the last few months i'm not sure what happened. Let me know if you need any more specific info.

Guru Elite
Posts: 8,641
Registered: ‎09-08-2010

Re: Multiple WLAN w/seperate DHCP Scopes

So your DHCP server is on the same L2 segment as your wireless clients?

Tim Cappalli | Aruba Security TME
@timcappalli | timcappalli.me | ACMX #367 / ACCX #480
Occasional Contributor II
Posts: 13
Registered: ‎02-01-2013

Re: Multiple WLAN w/seperate DHCP Scopes

It is, the dhcp server is the aurba controller each wlans vlan has its own scope configured on the controller.

Guru Elite
Posts: 8,641
Registered: ‎09-08-2010

Re: Multiple WLAN w/seperate DHCP Scopes

Sorry,  I meant your domain controller DHCP server. 


Tim Cappalli | Aruba Security TME
@timcappalli | timcappalli.me | ACMX #367 / ACCX #480
Occasional Contributor II
Posts: 13
Registered: ‎02-01-2013

Re: Multiple WLAN w/seperate DHCP Scopes

No the domain controller is on vlan1 of the cisco network, a port on the aruba controller also vlan1 is the uplink between aruba and our cisco lan additional each of the wlan 51/61 default router is a firewall port we have rules configured on the fw for traffic however shouldn't the dhcp broadcast be handled directly on the aruba controller?. The wlan i'm having an issue with is vlan51 there isn't a  vlan51 on the cisco cores (im using HSRP at the core level, my routes and vlans are located on the cores) in terms of vlans allowed on the trunk its 1-4094 so it includes the one i'm having an issue with the cisco switchport for the uplink also is allowing all vlans but again should these dhcp requests be traversing my cisco network at all?

MVP
Posts: 4,301
Registered: ‎07-20-2011

Re: Multiple WLAN w/seperate DHCP Scopes

 

 

Can you please share a drawing with your current setup ?

Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
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