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net/netcheck: preserve live home DERP through packet loss

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During a short period of packet loss, a TCP connection to the home DERP
may be maintained. If no other regions emerge as winners, such as when
all regions but one are avoided/disallowed as candidates, ensure that
the current home region, if still active, is not dropped as the
preferred region until it has failed two keepalives.

Relatedly apply avoid and no measure no home to ICMP and HTTP checks as
intended.

Updates tailscale/corp#12894
Updates tailscale/corp#29491

Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
James Tucker
2025-06-11 15:57:55 -07:00
committed by James Tucker
parent 3ed76ceed3
commit b0f7b23efe
5 changed files with 65 additions and 17 deletions
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cmd/tailscale/depaware.txt
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@@ -85,7 +85,7 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
tailscale.com/control/controlhttp from tailscale.com/cmd/tailscale/cli
tailscale.com/control/controlhttp/controlhttpcommon from tailscale.com/control/controlhttp
tailscale.com/control/controlknobs from tailscale.com/net/portmapper
tailscale.com/derp from tailscale.com/derp/derphttp
tailscale.com/derp from tailscale.com/derp/derphttp+
tailscale.com/derp/derpconst from tailscale.com/derp+
tailscale.com/derp/derphttp from tailscale.com/net/netcheck
tailscale.com/disco from tailscale.com/derp