User manual

www.cooperbussmann.com/wirelessresources
Cooper Bussmann 245U-E Wireless Ethernet Modem & Device Server User Manual
65Rev Version 2.19
3.21 DHCP Server Configuration
The 245U-E is able to act as a DHCP server, supplying IP addresses automatically to other DHCP client devices.
Note that the 245U-E units need to act in conjunction with their connected devices. If a connected device is a
DHCP server, the local and remote 245U-E units can be configured as DHCP clients and receive IP addresses
from the server device. Similarly, if a 245U-E is configured as a DHCP server, it can provide IP addresses to DHCP
clients—both 245U-E units as well as other connected devices. Configuration items for the DHCP server are listed
below.
Enabled Select this checkbox 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
Domain Name Service (DNS) 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 that have been
automatically assigned their IP address by a DHCP server (see section “3.21 DHCP Server Configuration.” DNS is
the system that translates Internet names (such as www.cooperbussmann.com/wirelessresources) to IP addresses.
The ELPRO 245U-E can act as a DNS server for a local network. Name to IP address mapping is 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 Select this checkbox 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 page. This is the name which is used to refer to this device (see
“3.24 Module Information”).
3.23 VLAN
What is VLAN
Virtual Local Area Network (VLAN) is a way of splitting a network into groups that could extend beyond a single
traditional LAN to groups of LANs, each identified with a different VLAN ID (VID). Using a VLAN, you can group
users by logical connections instead of physical location. This can increase security and help improve the efficiency
of traffic flow by limiting multicast and broadcast messages. Traffic between VLANs is blocked unless the VLAN is
identified with the correct VLAN ID.
There are three main VLAN modes that the 245U-E supports: