User`s guide

Chapter 5 WAN & 3G Cellular Screens
LAN-Cell 2 User’s Guide
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5.1.2 What You Need To Know About WAN
Encapsulation Method
Encapsulation is used to include data from an upper layer protocol into a lower layer protocol.
To set up a WAN connection to the Internet, you need to use the same encapsulation method
used by your ISP (Internet Service Provider).
If your ISP offers a dial-up Internet connection using PPPoE (PPP over Ethernet) or PPPoA,
they may also provide a username and password (and service name) for user authentication.
WAN IP Address
The WAN IP address is an IP address for the LAN-Cell, which makes it accessible from an
outside network. It is used by the LAN-Cell to communicate with other devices in other
networks. It can be static (fixed) or dynamically assigned by the ISP each time the LAN-Cell
tries to access the Internet.
If your ISP assigns you a static WAN IP address, they should also assign you the subnet mask
and DNS server IP address(es) (and a gateway IP address if you use the Ethernet or ENET
ENCAP encapsulation method).
" Most Cellular Network Operators provide WAN IP addresses using a form of
Dynamic Host Control Protocol (DHCP), even if your WAN IP address is
“static”. In these cases, configure the Cellular WAN IP Address Assignment
as “Get Automatically from ISP”.
Multiple WAN Interfaces
You can use a second WAN connection for load sharing to increase overall network
throughput or as a backup to enhance network reliability.
The LAN-Cell has one Ethernet WAN port. Inserting a 3G card adds a second WAN
(Cellular) interface. You can connect one interface to one ISP (or network) and connect the
other to a second ISP (or network).
If one WAN interface's connection goes down, the LAN-Cell can automatically send its traffic
through the other WAN interface when the WAN interfaces are configured for Fail-Over
Mode. See Chapter 5 on page 92 for details.
Optionally, the LAN-Cell can balance the load between the two WAN interfaces (see Section
on page 92).
You can use policy routing to specify the WAN interface that specific services go through. An
ISP may give traffic from certain (more expensive) connections priority over the traffic from
other accounts. You could route delay intolerant traffic (like voice over IP calls) through this
kind of connection. Other traffic could be routed through a cheaper broadband Internet
connection that does not provide priority service. The LAN-Cell's NAT feature allows you to
configure sets of rules for one WAN interface and separate sets of rules for the other WAN
interface. Refer to Chapter 13 on page 289 for details.