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- Using the value 0 sets the metric according to the defined default values. For this reason LANCOM Systems recommends not to use the value 0 should not be used.
- The value 255 describes the state when there is no connection (interface down). Consequently, this must not be selected for a connection.
- There are Administrative distance default values for routes from other sources (e.g. the value 20 for BGP). LANCOM Systems recommends to only use values between 5 and 14 for static routing entries, so that routing problems are avoided.
The route with the lower Administrative distance is the one that is selected. If this connection fails, the operating system sets the route to the value 255 (interface down) and the routing entry with the lowest Administrative distance becomes active.
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The use of the Administrative distance and the Backup table are mutually exclusive. |
Requirements:
- LCOS as of version 10.40 (download latest version)
- LANtools from version 10.40 (download latest version)
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1) Two internet connections are used for redundant operation:
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When using a plain Ethernet connection, you need to set up ICMP polling so that the router will detect a line failure. |
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1.7) This concludes the configuration of the backup scenario. Write the configuration back to the router.
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The following workaround only needs to be performed if you are using an LCOS version lower than LCOS 10.70: If ICMP polling is configured for the backup connection there will be a recurring buildup and breakdown of this connection. This is due to the connection being in the status Interface Down (255) and thus the polling packets can't be transmitted. The packets are therefore discarded by the Intruder detection in the firewall and the message packet received from invalid interface is shown. In order for the polling to work, a separate default route for the backup connection with an unused routing tag has to be created. In this case the Admin distance does not matter and therefore the value 0 is used.
If ICMP polling is configured for the main connection, a separate default route with an unused routing tag and the Admin distance 0 has to created, as otherwise a switch from the backup connection to the main connection won't be possible due to the Intruder Detection.
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2) At a remote location that cannot be accessed, an IKEv1 connection should be changed to an IKEv2 connection:
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2.2) Configuring the IKEv2 connection:
2.2.1) Manually set up an IKEv2 connection on both routers. The name of the VPN connection must be different from the name of the IKEv1 connection as the names have to be unique.
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