User guide

Raven EDGE/GPRS for Cingular - User Guide, version 2.31 29
Data Communication and Host Modes
Keepalive
Keepalive is used to test the Raven’s connection 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
ack
nowledgement indicates there is an active connection
to the network. If the Raven does not receive a response from the IP address, it will make addi-
tional attempts according to a backoff
algorithm before determining the Internet connection is not
functioning properly. If it determines the connection is not fucntioning, the modem will then
attempt to reconnect to Cingular to reestablish IP connectivity.
Configuring Keepalive
You can use Wireless Ace or a terminal connection to configure Keepalive (page 50). In Wireless
Ace, select Other from the groups menu on the left.
FIGURE 8. Wireless Ace: Keepalive Configuration
*IPPING sets t
he interval, in minutes, you want Keepalive to test the network connection. To
disable Keepalive, set *IPPING to 0 (default setting).
*IPPINGADDR sets the IP ad
dress you want to use for the connection test.
• *HOSTPRIVIP - Set to the IP address you want the Raven to give to your device.
• *HOSTPEERIP - Set to the IP address you want for the Raven.
• *HOSTNETMASK - Set to the subnetmask (generally, 255.255.255.0).
Note: If you are using Private Mode (*HOSTPRIVMODE=1), you will need to
make sure that *HOSTPRIVIP and *HOSTPEERIP are on the same subnet. If the
subnet mask is 255.255.255.0, it is safe to use 192.168.x.y for each as long as the x
is the same number (0 in the example screen shot above) and the y is different (1
and 2 in the example) and between 0 and 254. The screenshot shows an example.
Note: 15 minutes is the minimum time which can be set for Keepalive.