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USER'S GUIDE
Host
128.1.1.8
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.
100
SFVRA Configuration Manager
File
Server
Subnet 128.1.1.0
128.1.1.3
(128.1.1.2 uses WAN Direct Host Interface)
128.1.1.1
WORKGROUP REMOTE ACCESS SWITCH
B-CHANNELS
LAN
B1
B3
B5
B7
B9 B11
B13 B15
POWER
SERVICE
TX
RX
10BASE-T
E1
D
B2
B4
B6
B8
B10 B12
B14 B16
192.2.2.1
Subnet 192.2.2.0
Needed for
WAN Interface
192.2.2.3
Router
198.1.2.3
Subnet 198.1.2.0
(Uses WAN Interface)
Example 1: LAN, WAN and WAN Direct Host Interfaces
Host
128.1.1.2
Interfaces:
LAN Interface 128.1.1.1
E1 ONLY
B17 B19
B21 B23
B25 B27
B29
B31
T1
D
B18 B20
B22 B24
B26 B28
B30 L1
WAN Direct Host Interface
WAN Interface 192.2.2.1
both WAN Interfaces use
one PRI line
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