Digi WAN 3G User Manual page 76

Send Interval (Ping Test): The time interval in seconds between sending ping
requests during a ping link test. The ping tests sends a ping request. If no ping reply
is received before the Send Interval expires, another ping request is sent.
– TCP Connection Test: Click on the radio button to select the TCP Connection Test as
the link test to use for this interface. The TCP Connection Test attempts to establish a
TCP connection to the configured destination IP address and port number. If a
connection is successfully established, or if the remote host actively rejects (resets) the
connection attempt, the link test has successfully demonstrated that the network
interface can be used to communicate with the specified destination. If a TCP
connection is successfully established, it is immediately closed.
Primary TCP Port (TCP Connection Test: The destination TCP port to use to
connect to the Primary Destination address.
Primary Destination (TCP Connection Test): The primary, or first, destination to
which to establish a TCP connection. The Primary TCP Port is used as the port to
which the test connects at the Primary Destination. The destination must be a valid
IPv4 address. If the destination is left empty, no Primary Destination link test will be
attempted.
Secondary TCP Port (TCP Connection Test): The destination TCP port to use to
connect to the Secondary Destination address.
Secondary Destination (TCP Connection Test): The secondary, or second,
destination to which to establish a TCP connection. The Secondary TCP Port is used
as the port to which the test connects at the Secondary Destination. The destination
must be a valid IPv4 address. If the destination is left empty, no Secondary
Destination link test will be attempted.
Connection Timeout (TCP Connection Test): The time in seconds to wait for a
TCP connection to be established or rejected by the destination host.
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