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tailscale/netcheck
History
Brad Fitzpatrick 44b07aa708 netcheck: STUN less aggressively to known distant servers 
If Australia's far away and not going to be used, it's still going to
be far away a minute later. No need to send backup
just-in-case-UDP-gets-lost STUN packets to the known far away
destinations. Those are the ones most likely to trigger retries due to
delay anyway (in random 50-250ms, currently). But we'll keep sending 1
packet to them, just in case our airplane landed.

Likewise, be less aggressive with IPv6. The main point is just to see
whether IPv6 works. No need to send up to 10 packets every round. Max
two is enough (except for the first round). This does mean our STUN
traffic graphs for IPv4-vs-IPv6 will change shape. Oh well. It was a
weird eyeball metric for IPv6 connectivity anyway and we have better
metrics.

We can tweak this policy over time. It's factored out and has tests
now.
 		4 years ago
..
netcheck.go netcheck: STUN less aggressively to known distant servers 4 years ago
netcheck_test.go netcheck: STUN less aggressively to known distant servers 4 years ago