Note: Both the primary and backup detection servers should be stable and
reliable – if these servers fail to respond correctly in a timely manner, the modem
will attempt to drop and re-establish the connection. During this time, no incoming
or outgoing traffic can be send/received
Note: The main and backup WAN detection servers have the route to their IP
address bound to the specified link (main or backup). Therefore, main and backup
link detection servers are required to be different. This also means that the
detection servers should not also perform another required function – that is, you
should not assign the same IPs as used for link detection to DNS server(s), or to
be the target of serial port or GPS data etc.
Additional WAN options
Fixed WAN IP, Fixed WAN Gateway can be configured using the following
settings. Enabling this feature allocate modem with fix WAN IP with fix WAN
Gateway. Dial failure to restart (default 10 mins) feature along with Ppp
Asyncmap can also be enabled. Enabling dial failure to restart enable modem to
run the dial up script every 10 minutes.
STP
STP (Spanning Tree Protocol) allows for multiple redundant links while preventing
routing loops – packets do not “ping-pong” from router to router.
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