DHCP Scope not getting used after authentication

Jerome jc935 at cam.ac.uk
Mon Nov 30 04:25:04 CET 2020

Hi Alan, 

Thank you for your email. The users used to get a vlan tagged with their DHC request I  guess. That was how I think the old dhcp server was able to issue ipaddress on X and Y scopes. 
I see no traces of 2 VLANS mentions on any of the Free radius config files. This set up was working fine before the windows server upgrade. Is there a definite way to check if there are any VLANS assigned for the Authenticated users? I have access to the Radius server but do not have access to Homeserver. I hope the above makes sense. 


-----Original Message-----
From: Freeradius-Users [mailto:freeradius-users-bounces+jc935=cam.ac.uk at lists.freeradius.org] On Behalf Of Alan DeKok
Sent: 26 November 2020 23:34
To: FreeRadius users mailing list <freeradius-users at lists.freeradius.org>
Subject: Re: DHCP Scope not getting used after authentication 

On Nov 26, 2020, at 4:43 PM, Jerome <jc935 at cam.ac.uk> wrote:
> We have set up 2 Vlans to segment the buildings and assign static 
> vlans on the switch ports that connects to the Unifi AP. Depending on 
> the VLAN X or VLAN Y, the DHCP server should provide ipaddress from one of the subnet.
> Since the windows server upgrade on April 2020, the end devices are 
> picking only X subnet ipaddress. Y subnet is not issued. I have tested 
> with a test vm, can confirm that the Y subnet is issued. I have also 
> used the old windows DHCP server ip address but no changes.
> Does Free Radius setup has any role in this problem? 

  Maybe.  If the users are placed in the wrong subnet, then the DHCP server will just assign addresses from that subnet.

  You'll have to do some network tracing to see what's going on.  Look at the FR debug output, packet traces on the different VLANs, etc.

  Alan DeKok.

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