Dhcp Client - Siemens A53457 Installation & Maintenance

The WAG will select the first available, unassigned binding to offer the radio. Multiple
•
radios co-located with a WAG are issued bindings on a first-asked, first-served basis.
• After the WAG selects an available binding to offer the radio, the WAG will issue an ICMP
PING frame to determine whether any other device on the LAN has been assigned the
candidate IP address. Typically, the ICMP PING results in an Address Resolution Protocol
(ARP) request being sent first. If any device responds to the ARP frame, the WAG will send
the actual ICMP to the MAC address reported in the ARP. When a device reports back with
an ICMP PING response, this indicates the candidate IP address is already being used and
the WAG will select the next available unassigned binding.
• If no device responds to the PING, the WAG will offer the binding to the radio. The radio
will then indicate that the binding is acceptable, allowing the WAG to grant a firm lease on
the binding and record the binding as assigned to that radio.
If DHCP serving is disabled or there are no configured bindings, the WAG will ignore all DHCP
requests. If all configured bindings are already assigned and a radio requests configuration, the
WAG will ignore the DHCP request from that radio.
Site installation of radios with DHCP configuration is important to install and configure
properly. Whether it is the simple installation of one radio and one or more WAGs, or more
complex with multiple radios and one DHCP serving WAG, the WAG has the ability to trace
DHCP requests and replies. Additionally, the diagnostic command "status" offers information
about the five possible bindings (if assigned), so that the user may view a radio and its
assigned binding.
The DHCP Serving process is specifically designed so that if a radio is destroyed, a new one
may be installed without having to configure the radio because the WAG will perform this
function. The radio only has to be configured to request DHCP configuration. Further
description concerning DHCP tracing and details about the status report on assigned bindings
can be found in Section 3.
2.6.16

DHCP Client

The WAG may be configured to automatically acquire its IP address and IP Subnet Bitmask from a
DHCP Server. When the WAG's DHCP Client is configured for "Automatic," every time the WAG
acquires power it will issue a DHCP request. When the DHCP Server responds, the WAG will adopt
the offered IP address.
In the event a DHCP Server does not respond, the WAG will issue its request for IP configuration
periodically until it gets a response. During the time that the WAG is waiting for a DHCP Server to
offer an IP address, the WAG will utilize the IP address that it's currently configured with.
Document No.: COM-00-05-16
Version: C.1
INSTALLATION AND CONFIGURATION
2-31
June 2006, Revised June 2014