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af4a6682b4
Fixes #15523 Uses latest https://github.com/coder/tailscale which includes https://github.com/coder/tailscale/pull/85 to stop selecting paths with small MTU for direct connections. Also updates the tailnet integration test to reproduce the issue. The previous version had the 2 peers connected by a single veth, but this allows the OS to fragment the packet. In the new version, the 2 peers (and server) are all connected by a central router. The link between peer 1 and the router has an adjustable MTU. IPv6 does not allow packets to be fragmented by intermediate routers, so sending a too-large packet in this scenario forces the router to drop packets and reproduce the issue (without the tailscale changes).