User`s guide

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On units with only one Ethernet port, if more than one Ethernet instance exist these are
treated as logical Ethernet ports. These instances can be used to assign more than one
Ethernet IP address to a router.
On units with more than one physical Ethernet port, the Ethernet instances refer to the
different physical Ethernet ports. These units can be configured for either “HUB” mode or
“Port Isolate” mode.
In HUB mode all the Ethernet ports are linked together and behave like an Ethernet hub or
switch. This means that the router will respond to all of its Ethernet IP addresses on all of
its ports (as the hub/ switch behavior links the ports together).
In Port Isolate mode the router will only respond to its Ethernet 0 IP address on physical
port “LAN 0”, its Ethernet 1 IP address on physical port “LAN 1”, etc. The router will not
respond to its Ethernet 1 address on port “LAN 0” unless routing has been configured
appropriately.
When configured for HUB mode it is important that no more than one of the router’s ports is
connected to another hub or switch on the same physical network otherwise an Ethernet
loop can occur. The default behavior is “HUB” rather than “Port Isolate”.
Note:
VLAN tagging is not available when the router is configured for Port Isolate mode.
ETHn
This initial view only shows basic IP address parameters. The choice is to obtain an IP
address by using a DHCP server or to manually configure the IP addressing for this
interface.
Description
This parameter allows you to enter a name for this Ethernet instance, to make it easier to
identify.
Get an IP address automatically using DHCP
Selecting this option enables the DHCP client on this interface.
Use the following IP address
Selecting this option enables manual configuration of the IP addressing parameters
IP Address
This parameter specifies the IP address of this Ethernet port on your LAN.
Mask
This parameter specifies the subnet mask of the IP subnet to which the unit is attached
via this Ethernet port. Typically, this would be 255.255.255.0 for a Class C network.
Gateway
This parameter specifies the IP address of a gateway to be used by the unit. IP packets
whose destination IP addresses are not on the LAN to which the unit is connected will be
forwarded to this gateway.
DNS Server / Secondary DNS Server
These parameters specify the IP address of DNS servers to be used by the unit for
resolving IP hostnames.
Note: