Product and Software: This article applies to all Aruba controllers and ArubaOS versions.
In current networks, it is almost impossible to have DHCP server on every subnet. If no local DHCP server is present, a DHCP relay agent is required. The relay agent converts the broadcast DHCP request (which is not supposed to leave the local subnet) to a unicast request packet and forwards it to the DHCP server.When the DHCP server receives the DHCP request, the server checks the 'giaddr' field in the DHCP discovery packet to decide which scope to assign the IP address from. (The server does not have to do this per RFC, but this is generally how the server works). After an IP address is picked, the server sends a DHCP offer packet with a destination IP address that equals the 'giaddr' field.This process causes two issues:
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