Wireless Access

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Access network design for branch, remote, outdoor, and campus locations with HPE Aruba Networking access points and mobility controllers.
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Guest external DHCP and traffic routing

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  • 1.  Guest external DHCP and traffic routing

    Posted Feb 10, 2012 04:59 PM

    We currently have multiple controllers in different sites.  Each is providing DHCP for guest access via the local dhcp server on the controller.  We need to move the dhcp server to an external server because the internal has surpassed its purpose.

     

    What are recommendations for this in regards to the DHCP server placement?  How will the guest vlan have access to this server in order to get an ip address?



  • 2.  RE: Guest external DHCP and traffic routing

    Posted Feb 10, 2012 05:59 PM

    salvi, 

     

    You will have to configure the DHCP helper address "pointing to external DHCP server" under the guest VLAN interface. 

     

    (config) #interface vlan <guest-vlan>

    (config-subif)#ip helper-address ?
    <address> DHCP Server Address

     

     



  • 3.  RE: Guest external DHCP and traffic routing

    Posted Feb 10, 2012 06:02 PM

    Yes, but we are using asubnets that are not being routed through our local network.  In order to have a centralized DHCP server it would have to be located in our Core Network, which is in a different site.  We want to keep guest users off our local LAN.



  • 4.  RE: Guest external DHCP and traffic routing

    Posted Feb 10, 2012 06:07 PM
    @salvi wrote:

    Yes, but we are using asubnets that are not being routed through our local network.  In order to have a centralized DHCP server it would have to be located in our Core Network, which is in a different site.  We want to keep guest users off our local LAN.

    In that case, you can setup L2 GRE tunnels between the controllers and tunnel the guest vlan. 

     

    On Local controller 

     

    interface tunnel <tunnel-id>
    description "Tunnel Interface"
    tunnel source local-controller-ip
    tunnel mode gre 0
    tunnel destination dest-controller-ip
    tunnel vlan <guest-vlan>