Loopback Interface Parameters
The following are the properties can be specified for a loopback interface:
Name The logical name of the interface for display and reference in NetDefendOS.
Loop To This is the name of the other loopback interface in the pair. The other interface
will have this loopback interface for its Loop to property.
For each pair, the Loop to property must be left blank when the first interface is
created and then filled in later after its partner is created.
IP Address The IPv4 address assigned to the loopback interface. This is the address that
can be "Pinged" and can be used as the source address for dynamically
translated connections. This address can be any IP from the Network assigned
to the interface but must be different from the address assigned to the other
interface in the loopback pair.
Network The network assigned to the loopback interface and to which the above IP
Address belongs. This does not have to be the same network as the other
interface in the loopback pair.
Enable IPv6 If enabled, this option allows an IPv6 address and network to be entered.
Entering some IPv4 address and network is mandatory even if IPv4 is not
going to be used in the loopback setup.
One of two options can then be selected depending on how the loopback interface is to be used
with routing tables:
• Make the interface a member of all routing tables
Traffic arriving on this loopback interface will be routed according to the main routing table.
A route for this loopback interface's IP address will be inserted automatically into all routing
tables.
• Make interface a member of a specific routing table
With this option, a single route for this interface's IP will be inserted automatically into the
specified routing table. Only the specified routing table will then be used for route lookups
for traffic arriving on this interface.
Note: Routing rules can override table section
The above settings for route lookup can be overridden by a Routing Rule that triggers
for the traffic.
Only the Route for the IP Address is Added Automatically
Although routes are inserted automatically into routing tables when loopback interfaces are
created, this is only done for the loopback interface's IP address property. Other routes may have
to be added manually. For example, a route may need to be added manually which associates a
loopback interface with the network all-nets if the interface provides access to the Internet.
Loopback Interface IP Addresses
Chapter 3: Fundamentals
214
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