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198 | Uplink Configuration AOS-W Instant 6.3.1.1-4.0 | User Guide
l If the current uplink is 3G or Wi-Fi, and Ethernet has a physical link, the OAW-IAP periodically suspends user
traffic to try and connect to the VPN on the Ethernet. If the OAW-IAP succeeds, the OAW-IAP switches to
Ethernet. If the OAW-IAP does not succeed, it restores the VPN connection to the current uplink.
Uplink switching based on VPN status is automatically enabled if VPNis configured on the OAW-IAP. However,
you can specify the duration in VPN failover timeout field to wait for an uplink switch. By default, this duration is set
to 180 seconds. The OAW-IAP monitors the VPN status and when the VPN connection is not available for 3
minutes, the uplink switches to another available connection (if a low priority uplink is detected and the uplink
preference is set to none). When VPN failover timeout is set to 0, uplink does not switch over.
When uplink switching based on the Internet availability is enabled, the uplink switching based on VPN failover is
automatically disabled.
Switching Uplinks Based on Internet Availability
You can configure AOS-W Instant to switch uplinks based on Internet availability.
When the uplink switchover based on Internet availability is enabled, the OAW-IAP continuously sends ICMP
packets to some well-known Internet servers. If the request is timed out due to a bad uplink connection or uplink
interface failure, and the public Internet is not reachable from the current uplink, the OAW-IAP switches to a different
connection.
You can set preferences for uplink switching using AOS-W Instant UI and CLI.
In the AOS-W Instant UI
To configure uplink switching:
1. Click the System > show advanced settings > Uplink. The Uplink tab contents are displayed.
2. Under Uplink Management, configure the following parameters:
l VPN failover timeout To configure uplink switching based on VPNstatus, specify the duration to wait for
an uplink switch. The default duration is set to 180 seconds.
l Internet failover To configure uplink switching based on Internet availability, perform the following steps:
a. Select Enabled from the Internet failover drop-down list.
b. Specify the required values for Max allowed test packet loss and Secs between test
packets.
c. Click OK.
When Internet failover is enabled, the OAW-IAP ignores the VPN status, although uplink switching
based on VPN status is enabled.
In the CLI
To enable uplink switching based on VPN status:
(Instant Access Point)(config)# uplink
(Instant Access Point)(uplink)# failover-vpn-timeout <seconds>
(Instant Access Point)(uplink)# end
(Instant Access Point)# commit apply
To enable uplink switching based on Internet availability:
(Instant Access Point)(config)# uplink
(Instant Access Point)(uplink)# failover-internet
(Instant Access Point)(uplink)# failover-internet-pkt-lost-cnt <count>
(Instant Access Point)(uplink)# failover-internet-pkt-send-freq <frequency>
(Instant Access Point)(uplink)# end
(Instant Access Point)# commit apply
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