Velocity Edge GX440 User's Guide download pdf (Page 69)

LAN/Wi-Fi Configuration

Rev 1 Oct.13 69

Figure 4-2: Private Mode for SNMP-like applications

Sierra Wireless recommends a Private Mode network as the most reliable

configuration to use in a business continuity failover application as defined in the

AirLink ES440 Hardware User Guide (or Figure 4-2) with Reliable Static Routing

and Reverse Telnet. For more information, see Reliable Static Routing (RSR) on

page 88 and Reverse Telnet/SSH on page 158.

Public Mode

Public Mode is similar to IP pass-through except that in Public Mode the IP

address is also passed through from the MNO. The AirLink device acts like a

pass-through data connection for all traffic from the MNO. Public Mode is required

when the connected device needs a routable IP address and has no other

connection to obtain it.

In Public Mode the AirLink device does not have a routable IP address and

therefore applications such as SNMP on the AirLink device require hair-pinning

from the routable IP address on the connected router back to the AirLink device,

as shown in Figure 4-3, to serve SNMP-like applications. Sierra Wireless

recommends this configuration for connecting PCs or other endpoints that are

capable of responding to IP applications from the network. While hair-pinning on

the router is an acceptable configuration, it means SNMP-like data from the

AirLink device relies on the continuous operation of the router, whereas Private

Mode uses NAT to avoid the hair-pinning requirement.

Internet

AirLink device

Router or laptop

Non-routable IP address

Private mode

Routable IP address

Wireline gateway

Routable IP address

from wireline gateway

Router WAN ports

Non-routable IP address

WAN port 1

WAN port 2

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Velocity Edge GX440 User's Guide Page 69