B+B SMARTWORK SmartMotion, Configuration Manual

Page: 41 / 144

4. CONFIGURATION
You may set the
Check connection
flag in the second part of the window to enable au-
tomatic test messages for the cellular network. In some cases, the mobile WAN connection
could still be active but the router will not be able to send data over the cellular network. This
feature is used to verify that data can be sent over the PPP connection and supplements
the normal VRRP message handling. The currently active router (main/backup) will send test
messages to the defined
Ping IP Address at periodic time intervals ( Ping Interval ) and wait for
a reply ( Ping Timeout ). If the router does not receive a response to the Ping command, it will
retry up to the number of times specified by the Ping Probes parameter. After that time, it will
switch itself to a backup router until the PPP connection is restored.
Item Description
Ping IP Address Destination IP address for the Ping commands. In VRRPv3 mode
you can use IPv4 or IPv6 address. You can not use a domain
name.
Ping Interval Interval in seconds between the outgoing Pings.
Ping Timeout Time in seconds to wait for a response to the Ping.
Ping Probes Maximum number of failed ping requests.
Table 20: Check connection
You may use the DNS server of the mobile carrier as the destination IP address for the test
messages (Pings).
The Enable traffic monitoring option can be used to reduce the number of messages that
are sent to test the PPP connection. When this parameter is set, the router will monitor the
interface for any packets different from a ping. If a response to the packet is received within the
timeout specified by the
Ping Timeout parameter, then the router knows that the connection is
still active. If the router does not receive a response within the timeout period, it will attempt to
test the mobile WAN connection using standard Ping commands.
4.2.1 Example of VRRPv2 Configuration in IPv4 Network
Figure 20: Topology of VRRP Configuration example
31