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Regular Contributor I
Posts: 177
Registered: ‎10-05-2011

Guest external DHCP and traffic routing

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?

Retired Employee
Posts: 234
Registered: ‎04-19-2011

Re: Guest external DHCP and traffic routing

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

 

 

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HT
Regular Contributor I
Posts: 177
Registered: ‎10-05-2011

Re: Guest external DHCP and traffic routing

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.

Retired Employee
Posts: 234
Registered: ‎04-19-2011

Re: Guest external DHCP and traffic routing


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> 

 

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HT
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