I currently use Uplink Balancing for failover backup purpose. In detail a have a primary cable line and a failover dsl line. This configuration was working quite good until weekend where I had a maintenance window to do about 6 deferred firmware upgrades. Now current fw version is 9.506-2.
Right after the last upgrade I noticed that the primary line appears to be instable since the failover kicked in about once per hour switching to backup and after few minutes back to primary. It was so annoying that I had to login remotely and disable the notifications about the WAN down & up.
Now I think there could be several reasons for this behavior:
1. The "automatic" monitoring (currently used) has been changed to be more ambitious (detecting even short outages) in one of the latest fw releases.
2. The servers that are used for "automatic" monitoring are difficult to reach
3. The primary line has become unstable on the same weekend when I did my upgrades - which would be a big coincidence
Is it possible to find out which servers are uses by "automatic monitoting" and how it is done in detail (ICMP/Ping, etc.) ?
Should I rather configure "other" servers for monitoring? But which one to choose? Ask my provider or maybe ping google dns servers 8.8.8.8/8.8.4.4 ?
Any other ideas how to fix this instability?
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