DHCP Relay Over WAN

[JasonGorman1808]

I have 3 flexed WLANs at a branch that will receive DHCP from Windows at our DC. I'm unsure of what to set the relay to. Is it our L3 SVI which in turn relays to the DC or do we set the relay to the IP of the Windows server at the DC? 

Thanks in advance

[MHM Cisco World]

Use the IP of dhcp server as relay IP

MHM

[Flavio Miranda]

@JasonGorman1808 

 If by flexed you mean flexconnect, meaning, the DHCP will be asked locally on each branch, then what you need to do is , on the branch layer3 device, on the SVI, add the command ip helper-address and point to the DHCP server remotely.

ip helper-address x.x.x.x <-- IP address of the DHCP server

[JasonGorman1808]

Yes, flexconnect. Sorry for the confusion. The WLC is at our DC along with our DHCP server.  Right now I have the controller set as below.  Our branch gateway is a SilverPeak appliance that is relaying to the DHCP at the DC.  

Thank you

[Flavio Miranda · Accepted solution]

should be it, the SilverPeack should transform the DHCP request from clients which is a broadcast into a unicast packet and send it out to your DC.

Just make sure you dont have the "Central DHCP" as ENABLED, in that case the WLC is talking to the DHCP server and not the client.

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