User`s guide

USER’S GUIDE
100 SFVRA Configuration Manager
In Example 1, we show three different types of network interfaces and the IP subnets that are used.
It should be noted that even though a device only has one physical connection to the WAN, it has
more than one logical connection. Also, each one of these logical interfaces can be in different
subnetworks.
The LAN interface is the simplest. It specifies the IP address (128.1.1.1) which connects the system
to the Ethernet LAN. The Direct Host interface doesn’t have an IP address. Devices that use this
interface must have an IP address that is on the LAN subnet. The WAN interface in this example is
used to connect two IP subnets (128.1.1.0 and 198.1.2.0). A separate subnet (192.2.2.0) is required to
connect the subnets. If the remote router supports unnumbered interfaces (as shown in Example 2),
then the connecting subnet would not be required.
ISDN
Host
File
Server
Host
Router
128.1.1.8 128.1.1.3
Subnet 128.1.1.0
(128.1.1.2 uses WAN Direct Host Interface)
128.1.1.2
Interfaces:
LAN Interface 128.1.1.1
WAN Direct Host Interface
WAN Interface 192.2.2.1
both WAN Interfaces use
one PRI line
198.1.2.3
Subnet 198.1.2.0
(Uses WAN Interface)
192.2.2.1
Subnet 192.2.2.0
Needed for
WAN Interface
128.1.1.1
192.2.2.3
Example 1: LAN, WAN and WAN Direct Host Interfaces
B25 B27
B26 B28
WORKGROUP REMOTE ACCESS SWITCH
B29
E1 ONLYB-CHANNELS
LAN
10BASE-TRXTXSERVICE
B31
B30 L1
B21 B23
B22 B24
B17 B19
B18 B20
B13 B15
B14 B16
E1
D
T1
D
B9 B11
B10 B12
B5 B7
B6 B8
B1 B3
B2 B4
POWER