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Software Manual 50

Network Tab

Use WWAN for LTE: This option will convert non Verizon, SN/RAM 67xx and 97xx units, to a new wwan0 interface. Sig-

nificantly improved transfer speeds will be available. If some special circumstance requires continued use of ppp0, this

option may be disabled, but slower speeds may result. The recommended setting for this field is YES.

Select Cellular Network Speed: Select the connection speed to be used for the cellular modem connection from the

drop down list provided. Possible values include: Auto, High and Low. The recommended setting for this field is Auto.

Cellular MTU: Enter the MTU size you desire to use. In computer networking, the maximum transmission unit (MTU)

of a communications protocol of a layer is the size (in bytes) of the largest protocol data unit that the layer can pass

onwards. MTU parameters usually appear in association with a communications interface (NIC, serial port, etc.). Stan-

dards (Ethernet, for example) can fix the size of an MTU; or systems (such as point-to-point serial links) may decide

MTU at connect time. A larger MTU brings greater efficiency because each packet carries more user data while proto-

col overheads, such as headers or underlying per-packet delays, remain fixed; the resulting higher efficiency means a

slight improvement in bulk protocol throughput. A larger MTU also means processing of fewer packets for the same

amount of data. In some systems, per-packet-processing can be a critical performance limitation.

However, this gain is not without some downside. Large packets can occupy a slow link for some time, causing greater

delays to following packets and increasing lag and minimum latency. For example, a 1500-byte packet, the largest

allowed by Ethernet at the network layer (and hence over most of the Internet), ties up a 14.4k modem for about one

second.

The recommended setting for this field is 1500.

Sync Time: This option will attempt to take the local time as reported by the cellular tower, and set the unit’s system

time to match. The recommended setting for this field is Yes, unless another method of time Sync, such as NTP is

being used.

Choose Connection Behavior: In Persistent mode, the unit will always attempt to maintain a cellular connection with

the carrier’s network. In On-Demand mode, the connection to the cellular network will only be attempted when pack-

ets are destined to leave the wireless interface. In addition, after a period of Idle Time, the connection will terminate.

Persistent mode has the potential to use more bandwidth in a limited data plan meant for fallback. For this reason,

On-Demand is commonly chosen for an environment using an ethernet connection as a primary interface, while IP

Fallback is used to bring up the secondary wireless connection as a backup. Modern cellular connections use idle

states in on-board radios to often negate the need for an On-demand option.

Maximum Receive Idle Time (rxidle): Enter the number of seconds the connection may be allowed to remain “idle” or

“unresponsive” (no data received) before closing the connection. If packets are leaving the interface, but no return

packet is received for the specified time, then the connection is reset. This can be useful for detecting an unresponsive

situation where the network is down, the modem is in an unknown state, or other low level error may have occurred.

Note: If the normal usage of the device regularly has packets leaving the unit with no expected response, then prema-

ture disconnections may result. Outgoing UDP packets with no expected response may be normal operation, yet will

trigger this disconnection and reset.

The recommended setting for this field is 0 to turn off. The recommended value to enable this feature is 150 seconds

(2.5 minutes).

User Default Route: This field allows you to choose to have the default route for the Red Lion router to be the cellular

connection when it is connected, or to designate an Ethernet port as the default route. Select Yes to have the cellular

connection use the default route once it is connected.

Use Peer DNS: Select Yes to have the cell connection accept DNS information from the peer device to which it is con-

nected.

Auto add SNAT rule: When turned on, this option runs a script which, when a cellular connection comes up, will add a

firewall rule which forces a packet to source the IP address that the PPP interface receives from the remote ISP.

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