Situation: After enabling the DHCP Proxy in Cisco WLC by
following this instruction:
The DHCP proxy
ideal for all network environments.
The controller modifies
and relays all DHCP transactions
and address certain
The controller’s virtual
is normally used as the source
IP address of all DHCP transactions
to the client.
As a result, the real DHCP server
is not exposed
in the air.
in debug output for DHCP transactions
on the controller. However, using
IP address can cause
issues on certain
types of clients.
DHCP proxy mode operation
the same behavior
for both symmetric
offers are coming
from external DHCP servers, the DHCP proxy normally selects the
one that comes
in and sets the
IP address of the server
in the client
data structure. As a result, all following
go through the same DHCP server until
the proxy selects a different
DHCP server for the client.
is enabled by default. All controllers that will
must have the same DHCP proxy setting.
If you use an external DHCP, you should
disable the DHCP proxy. Otherwise, the AP will keep the IP
address and that may cause the IP conflict. In below example, it
shows 133 clients, but it doesn't have any wireless devices
connecting to the AP. If you check teh bad address in DHCP, you
will see some same IP address here.