Chapter 6 Network parameters
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6.2.1 Description of line combination function
1. Line detection mechanism
Regardless of line combination modes, make sure that the network is not interrupted when the line
fails, which require that the device must be able to monitor line status in real time. To this end, we
designed a flexible automatic detection mechanism, and provide a variety of line detection
methods for users to choose, in order to meet the practical application needs.
To facilitate understanding, several related parameters are introduced first.
Detection interval: the time interval of sending inspection packets. One inspection packet is sent
per time, and the default value is 0 seconds. In particular, when the value is 0, it means not to
make line detection.
Detection times: The number of inspection packets sent within each detection cycle.
Destination IP address: The object of detection. The device will send inspection packets to the
pre-designated target to detect if the line is normal.
The following is an introduction of the device's line detection mechanism in two cases: line
normal and line failure.
When a line fails, the detection mechanism is described as follows: The device will send an
inspection packet to the detection target of the line at the specified detection interval. If all the
inspection packets sent have no response within a detection cycle, this line will be deemed to be
failed, and it will be shielded immediately. For example, if the 3 inspection packets that are sent
have no response within a detection cycle, the line is deemed to be failed by default.
When a line is normal, the detection mechanism is described as follows: Similarly, the device will
send an inspection packet to the detection target of the line at the specified detection interval. If
half of the inspection packets or above sent have response within a detection cycle, this line will
be deemed to be normal, and it will be restored. For example, if the 3 inspection packets that are
sent have response within a detection cycle, the line is deemed to be restored by default.
The device allows users to specify Internet lines for some hosts in the Intranet in advance, which
is realized by setting the "Internal starting IP address" and "Internal end IP address" of the line,
and the hosts whose IP addresses are within two address ranges will give priority to the use of the
specified line. For the hosts with the specified Internet line, they can only access to the Internet
through that line when the specified line is normal. However, when the specified line fails, they
will use other normal lines for Internet access.
Tip:Line detection is not enabled, then the "Detection interval" should be set to "0" second.
2. Line combination mode
The device provides 2 line groups: "Main line" group and "Backup line" group. For convenience's
sake, the lines in the "main line" group are collectively known as main line, and the lines in the
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