Digi WAN 3G User Manual page 167

SureLink statistics
Digi SureLink ™ provides an "always-on" mobile network connection to ensure that a Digi device
is in a state where it can connect to the network. The statistics displayed for Digi SureLink pertain
to the periodic tests, known as Link Integrity Monitoring tests, that are run over the established
PPP connection to ensure that end-to-end communication is possible. There are three Link
Integrity Monitoring tests available: Ping Test, TCP Connection Test, and DNS Lookup Test. For
descriptions of these tests, see "Link integrity monitoring settings" on page 106.
In these SureLink statistics, a "session" is a PPP session. The session statistics are reset to zero at
the start of a new PPP connection. The "total" statistics are the accumulated totals for all sessions
since the device booted. The "tests" are the SureLink Link Integrity Monitoring tests that have
been configured to be run when the mobile network connection is established.
session successes
The number of times a configured test was attempted and succeeded in the current PPP
session.
session failures
The number of times a configured test was attempted but failed in the current PPP session.
session consecutive failures
The number of consecutive failures for a test, with no success. When a test is successful, the
consecutive failures counter is reset to zero. The consecutive failures counter indicates a
device's "progress" toward the configured maximum number of consecutive failures, after
which the PPP link is taken down (and restarted).
session bypasses
If a configuration parameter is bad, a test is bypassed rather than considered to have
succeeded or failed. This means the test was not run. If the PPP connection goes down while
a test is in progress, that test may be classified as bypassed, since it could not be run. (Note
that the PPP link may come down for many reasons, independent of SureLink testing.)
total successes
The total number of times a configured test was attempted and succeeded since the Digi
device was booted.
total failures
The total number of times a configured test was attempted but failed since the Digi device
was booted.
total link down requests
The number of times the SureLink feature has failed consecutively the configured number of
failures and, as a result, requested that PPP shut down and restart its connection. This statistic
counts such occurrences during the current device boot. SureLink itself does do the PPP stop/
start; it sends a message to PPP asking it to do so, owing to a Surelink test failure.
total bypasses
The total test bypasses (see "session bypasses") since the Digi device was rebooted.
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