Dual-Wan & Strange gateway monitoring issue
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I've configured Dual-Wan for fail-over but I've got a problem that I can't figure out.
Gateway1 is configured for interface Wan1 with monitor IP 8.8.8.8
Gateway2 is configured for interface Wan2 with monitor IP 8.8.4.4
While capturing packets on both interfaces and both ISPs are functioning, I clearly see pings to 8.8.8.8 going out interface Wan1, and pings to 8.8.4.4 going out interface Wan2 as expected.
When ISP service for Wan1 fails after a little while the pings to 8.8.8.8 start going out the interface for Wan2 with the source IP of the Wan2 interface instead. This makes the gateway for Wan1 appear online. But Wan1 isn't online.
How do I ensure that the gateway for Wan1 is only sending pings out of the interface Wan1? I can think of some firewall rules that might work, is that supposed to be part of the normal dual-wan config? I didn't see that mentioned in the documentation or any examples, or I missed it.
Thank you