Multi-WAN 2 tier and Unbound DNS has DNS failure mode v.2

[nutseo6]

I have 2 WANs set up as tier 1 and 2, and I enabled Unbound DNS. Today the tier 1 WAN failed completely and tier 2 WAN took over. Pings of ip addrs and existing connections over tier 1 were working, but new DNS lookups did not.

I was able to get Unbound DNS working again by picking my tier 2 WAN only in "Outgoing Network Interfaces". When this was set to the recommended Any or if I checked both WANs, DNS did not work.

Is this a bug? I have Opnsense 19.1.4

I thought Unbound DNS would send requests over both WANs. It seems like the wrong approach to fail when I am using Multi-WAN. Should I not use Unbound DNS if I have Multi-WAN?

(Interesting observation: I often have partial failover of WAN due to high packet loss almost every day, but it took a rare complete failure to see this problem. I think Unbound DNS always uses the top tier.)

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[franco]

I believe this amendment to the documentation is exactly what you're asking about:

https://github.com/opnsense/docs/commit/9268e6163be9c5


Cheers,
Franco