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245U-E Wireless Ethernet Modem User Manual
Rev Version 2.24
Select “Blacklist” or
“Whitelist”
A blacklist will block ARP requests that match the entry. A whitelist will allow
only ARP requests that match the entry. All other devices are blocked.
Add Entry
Add a row to the table of ARP address filter rules.
Delete Entry
Delete the currently selected ARP address filter rule.
Enable
Select this checkbox to enable the rule.
IP Address
This sets the IP address that you wish to filter.
IP Netmask
Sets the IP netmask.
Save Changes
Save changes to non-volatile memory (reset is required to activate).
Save Changes and
Reset
Save to non-volatile memory and restart to activate changes.
3.20 DHCP Client Configuration
Dynamic Host Configuration Protocol (DHCP) allows DHCP clients to automatically obtain their IP address
at startup. This simplifies network administration because there is no need to manually configure each
device with a separate IP address. The 245U-E is able to act as a DHCP client. To set the 245U-E to acquire
its IP address from a DHCP server, select the option “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 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