D-Link NetDefendOS User Manual page 327

Here, each organization gets a virtual system of its own. These connect to the main routing table
using pairs of loopback interfaces. The routing tables would have the following entries:
Routing Table main
Route #
1
2
3
Routing Table vs1
Route #
1
2
Routing Table vs2
Route #
1
2
Ethernet Interfaces
Interface #
1
2
3
Loopback Interfaces
# Name
1 main-vs1
2 vs1-main
3 main-vs2
4 vs2-main
For each connection between a pair of virtual systems, a pair of loopback interfaces is required,
one for each system. When traffic is sent through main-vs1, it arrives on vs1-main. When traffic is
sent through vs1-main, it is received on main-vs1. This is exactly the same as with two NetDefend
Firewalls and two interfaces, one on each, with a connection between them.
The Routing Table Membership setting means that if a connection arrives on an interface, it will be
routed according to the routing table that the interface is a member of.
Interface
main-wan
main-vs1
main-vs2
Interface
vs1-main
vs1-lan
Interface
vs2-main
vs2-lan
Name
main-wan
vs1-lan
vs2-lan
IP Address
ip_main-wan
pubip-vs1
ip_main-wan
pubip-vs2
327
Network
all-nets
pubip-vs1
pubip-vs2
Network
all-nets
192.168.0.0/24
Network
all-nets
192.168.0.0/24
IP Address
ip_main-wan
192.168.0.1
192.168.0.254
Loop to
vs1-main
main-vs1
vs2-main
main-vs2
Chapter 4: Routing
Gateway
wan_gw
Gateway
Gateway
Routing Table
main
vs1
vs2
Routing Table
main
vs1
main
vs2