Weidmuller Wireless Ethernet Modem & Device Server WI-MOD-E-G/A User Manual
Rev.
2.16
www.weidmuller.com
63
3.20 - DHCP Client Configuration
DHCP (Dynamic Host Configuration Protocol) allows DHCP Clients to automatically obtain their IP Address at start-up.
This simplifies network administration, as there is no need to manually configure each device with a separate IP Address.
The WI-MOD-E is able to act as a DHCP client. To set the WI-MOD-E to acquire its IP address from a DHCP Server,
check the box “Obtain IP Address Automatically” on the Network Configuration page.
When configured as a DHCP Client the “Device Name” on the Module Information page will be the module identifier (as
the IP address will be unknown) and so should be given a unique name.
3.21 - DHCP Server Configuration
The WI-MOD-E is able to act as a DHCP server, supplying IP addresses automatically to other DHCP Client devices.
Note that the WI-MOD-E units need to act in conjunction with their connected devices. If a connected device is a DHCP
server, the local and remote WI-MOD-E units can be configured as DHCP Clients and receive IP addresses from the
server device. Similarly, if a WI-MOD-E is configured as a DHCP server, it can provide IP addresses to DHCP Clients,
both WI-MOD-E units as well as other connected devices. Configuration items for the DHCP Server are listed below.
Enabled
Tick this box to enable the DHCP Server
IP Range Minimum
/ Maximum
The DHCP Server will assign IP addresses to DHCP Clients from within this range
of addresses.
Gateway / Primary
DNS / Secondary
DNS
These Settings are common to all of the DHCP Clients, and refer to the gateway
address, and Domain Name Service (DNS) Configuration
Lease Time
This is the number of seconds the client is granted the assigned IP address. The
client should renew its lease within this time.
3.22 - DNS Server Configuration
DNS (Domain Name Service) allows devices to be given human-readable names in additions to their IP address. This
makes identification of devices (hosts) simpler, and makes it possible to identify devices which have been automatically
assigned their IP address by a DHCP server (See section 3.21 - “ DHCP Server Configuration”). DNS is the system
which translates internet names (such as www.weidmuller.com) to IP Addresses. The WEIDMULLER WI-MOD-E can act
as a DNS Server for a local network. Name to IP address mapping are automatically updated by the built in DHCP server
when it issues an IP address to a client unit.
For the DNS Server configuration to be effective, Each DNS Client must be configured with the address of this DNS
server, as either the primary or secondary DNS (secondary DNS is only used if there is no response from the primary
DNS). Normally, this is done by setting the primary DNS field of the DHCP server configuration to the wireless IP address.
This address is then provided to client units to use as their primary DNS server address when the DHCP server issues an
IP address. The DNS Server is configured using the following settings.
Enabled
Tick this box to enable the DNS Server
Domain
Name
This is a common suffix applied to the name of each device in the network. If your
network is part of a larger network, this would be assigned to you by the relevant naming
authority. If your network is stand-alone, this field is set to an arbitrary name of your
choice.
Device Name
(Host Name)
This is the DNS name of the local device. (Commonly referred to as the host name or
computer name). This setting is duplicated on the main Module Information configuration
age. This is the name which is used to refer to this device. (Refer 3.24 - “Module
Information”)
