9: Administration
SGX 5150 IoT Device Gateway User Guide 123
Notes:
If the keep alive time expires, the user timeout is expired, and there are probes in
flight, the connection will be reset. For this reason, it is recommended that if keep alive
is used in conjunction with the user timeout, the keep alive timeouts be larger than the
user timeout. If it is smaller, what will typically be seen is that the initial probe will be
sent, then at the interval where the next probe would normally be sent, the connection
will be reset, with no additional probes sent. Also note that in these cases: if the keep
alive timer is significantly smaller than the user timeout, probes will continue to be sent
for an unreachable host until the user timeout expires.
If there is data in flight when the TCP retransmission timeout kicks in, the user timeout
is checked as a limiting condition only when the timer expirations would normally be
checked during RTO handling. In other words, the user timeout will not be an exact
limit; in practice, it will always take somewhat longer for the connection to be closed.
The longer the user timeout is, the more likely it will expire between exponentially
slower retransmissions, and the connection will not experience an error until the next
retransmission timeout is checked. Also note that the user timeout expiration during
retransmission returns an error to the application; it does not automatically reset the
connection as happens with keep alive timeout. It is up to the application (e.g.,
tunneling) to close the connection (this happens almost immediately with tunneling).
To Configure Tunnel Connect Mode Settings
Using Web Manager
To configure the Connect Mode for a specific tunnel, on the Administration page, click
Tunnel > Tunnel 1 > Connect Mode.
Using the CLI
To enter the Tunnel 1 Connect Mode command level: enable > tunnel 1 > connect
Using XML
Include in your file: <configgroup name="tunnel connect" instance="1">
Connecting Multiple Hosts
If more than one host is configured, a Host Mode option appears. Host Mode controls how
multiple hosts will be accessed. For the SGX 5150, the Connect Mode supports up to 32 hosts.
Hosts may be accessed sequentially or simultaneously:
Sequential – Sequential host lists establish a prioritized list of tunnels. The host specified as
Host 1 will be attempted first. If that fails, it will proceed to Host 2, 3, etc, in the order they are
specified. When a connection drops, the cycle starts again with Host 1 and proceeds in order.
Establishing the host order is accomplished with host list promotion (see Host List Promotion
on page 124). Sequential is the default Host Mode.
AES Decrypt Key Enter the AES Decrypt Key and select Text or Hexadecimal to indicate format.
This configuration field becomes available when the TCP AES or UDP AES
protocol is selected.
Initial Send Enter the Initial Send character and select either Text or Binary format. This
configuration field becomes available when the SSH, TCP, UDP, or UDP AES
protocol is selected.
Host Field Description
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