Use The Surelink Wizard - Digi TransPort WR11 User Manual

Using the web interface

Use the SureLink wizard

Use the SureLink wizard to configure the Digi TransPort router to stay connected to the W-WAN
(Wireless Wide Area Network) under adverse conditions. The Digi TransPort router has several
features designed to recover from network issues and other problems.
Automatic power cycling of the internal Wireless WAN radio occurs if the PPP link to the network
cannot be established. If a problem occurs when the PPP link is already established, some mechanism
must be employed to detect the dead link and deactivate it. There are two types of dead link
detection techniques: passive and active. Before selecting your preferred technique, read the
following explanation carefully, because it is important that you make the correct selection for your
circumstances.
Passive link detection techniques
Passive techniques work by monitoring data that is regularly sent over the W-WAN. Because it is
necessary for data to be sent over the W-WAN for a problem to be detected, these techniques are only
suitable when the equipment on the router's Local Area Network (LAN) regularly sends data over the
W-WAN. The main advantage of passive techniques are:
No additional data charges (if your mobile operator charges you for data).
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In a hub and spoke deployment, no additional load will be placed on equipment at the hub.
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The main disadvantages are:
If the equipment on the LAN does not regularly send data over the W-WAN and a problem with
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the connection occurs, it is not possible to connect to the router or the router's LAN remotely
until the equipment on the LAN sends data.
Because the Digi TransPort router requires a certain amount of time to detect and recover
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from a network problem, if a problem does occur, the equipment on the LAN is subject to
delays when it first attempts to send data.
Active link detection techniques
Active techniques work by sending test data to the link. For example, a ping, UDP packet or IPsec
keep-alive (Dead Peer Detection) packet may be sent. The main advantage of active techniques are:
Problems are detected promptly, and the availability of remote access to the router or its LAN
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is maximized.
Problems can be repaired before equipment on the router's LAN needs to use the W-WAN,
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resulting in no delays when sending data.
The main disadvantages are:
Digi TransPort® Routers User Guide
Use the web interface wizards
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