Data Communication and Host Modes

as subnet masks, routers, etc.) to each computer or device without the need to set up each specifically or keep track of what addresses have already been used.

In a default configuration, the PinPoint X acts as a DHCP host to any device connected to its ports, providing that device with an IP address which can be used to communicate on the Internet. In Public Mode, that will be the IP address assigned by the cellular network. In Private Mode, that will be the IP address defined in *HOSTPRIVIP.

1.When the PinPoint X registers on the cellular network, it is assigned an IP address from AT&T, let’s say A.B.C.D.

2.Acting as a DHCP server, in Public Mode, when the PinPoint X receives a DHCP request from an Ethernet device, it hands off the assigned address to the device and sets up the default gateway address as A.B.C.1. If the fourth octet is already a 1, it assigns A.B.C.2 as the router address.

3.The PinPoint X also sends a /24 netmask (255.255.255.0 by default) and sets up a static route which maps 192.168.13.31 (or the address configured with *HOSTPEERIP if it is changed) to A.B.C.1 (or A.B.C.2 if that was what the gateway address was given as).

Tip: When PPPoE is used with the PinPoint X, DHCP is not needed. A tunnel is set up connecting a device (such as your computer or a router) with the modem. The device will then simply use the MAC address of the PinPoint X to send all outgoing packets.

Keepalive

Keepalive is used to test the connection to the cellular network by pinging an IP address after a specified period of inactivity. Keepalive is only recommended for users who have a remote terminated modem that infrequently communicates to the network or if you have experienced issues over time where the modem can no longer be reached remotely.

When Keepalive pings the IP address, an acknowledgement indicates there is an active connection to the network. If the PinPoint X does not receive a response from the IP address, it will make additional attempts according to a backoff algorithm before determining the Internet connection is not functioning properly. If it determines the connection is not functioning, the modem will then attempt to reconnect to AT&T to reestablish IP connectivity.

 

 

 

 

 

 

 

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Sierra Wireless 20070914 manual Keepalive

20070914 specifications

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