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Investigate random DNS failures #12

@cohoe

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@cohoe

The resolver sporadically fails to resolve names. Seems random and not repeatable. Could be a cache and/or rate limit thing?

Also could be v6 related:

[1624389218] libunbound[21:0] error: udp connect failed: Cannot assign requested address for 2001:500:12::d0d port 53
[1624389218] libunbound[21:0] error: udp connect failed: Cannot assign requested address for 2001:503:ba3e::2:30 port 53
[1624389218] libunbound[21:0] error: udp connect failed: Cannot assign requested address for 2001:503:c27::2:30 port 53
[1624389218] libunbound[21:0] error: udp connect failed: Cannot assign requested address for 2001:500:2d::d port 53
[1624389218] libunbound[21:0] error: udp connect failed: Cannot assign requested address for 2001:dc3::35 port 53

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