Netgear FVS336G-300NAS Specifications download pdf (Page 651)

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System Logs and Error Messages

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ProSAFE Dual WAN Gigabit WAN SSL VPN Firewall FVS336Gv3

becomes active only until the primary link comes back up. The VPN firewall monitors the

status of the primary link using the configured WAN failure detection method.

This section describes the logs generated when the WAN mode is set to auto-rollover.

Table 24. System logs: WAN status, auto-rollover

Message Nov 17 09:59:09 [FVS336Gv3] [wand] [LBFO] WAN1 Test Failed 1 of 3 times_

Nov 17 09:59:39 [FVS336Gv3] [wand] [LBFO] WAN1 Test Failed 2 of 3 times_

Nov 17 10:00:09 [FVS336Gv3] [wand] [LBFO] WAN1 Test Failed 3 of 3 times_

Nov 17 10:01:01 [FVS336Gv3] [wand] [LBFO] WAN1 Test Failed 4 of 3 times_

Nov 17 10:01:35 [FVS336Gv3] [wand] [LBFO] WAN1 Test Failed 5 of 3 times_

Nov 17 10:01:35 [FVS336Gv3] [wand] [LBFO] WAN1(DOWN), WAN2(UP),

ACTIVE(WAN2)_

Nov 17 10:02:25 [FVS336Gv3] [wand] [LBFO] WAN1 Test Failed 6 of 3 times_

Nov 17 10:02:25 [FVS336Gv3] [wand] [LBFO] Restarting WAN1_

Nov 17 10:02:57 [FVS336Gv3] [wand] [LBFO] WAN1 Test Failed 7 of 3 times_

Nov 17 10:03:27 [FVS336Gv3] [wand] [LBFO] WAN1 Test Failed 8 of 3 times_

Nov 17 10:03:57 [FVS336Gv3] [wand] [LBFO] WAN1 Test Failed 9 of 3 times_

Nov 17 10:03:57 [FVS336Gv3] [wand] [LBFO] Restarting WAN1_

Explanation The logs suggest that the failover was detected after 5 attempts instead of 3.

However, the reason that the messages appear in the log is because of the WAN

state transition logic, which is part of the failover algorithm. These logs can be

interpreted as follows:

The primary link failure is correctly detected after the third attempt. Thereafter, the

algorithm attempts to restart the WAN connection and checks once again to

determine if WAN1 is still down. This results in the fourth failure detection message.

If it is still down, then it starts a secondary link, and once the secondary link is up,

the secondary link is marked as active. Meanwhile, the primary link has failed once

more, and that results in the fifth failure detection message. Note that the fifth

failure detection message and the message suggesting that the secondary link is

active have the same time stamp, and so they happen in the same algorithm

state–machine cycle. So although it appears that the failover did not happen

immediately after 3 failures, internally, the failover process is triggered after the

third failure, and transition to the secondary link is completed by the fifth failure.

The primary link is also restarted every 3 failures till it is functional again. In these

logs, the primary link was restarted after the sixth failure, that is, 3 failures after the

failover process was triggered.

Recommended action Check the WAN settings and WAN failure detection method configured for the

primary link.

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