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by jiggawatts
2144 days ago
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Path MTU Discovery is broken in Azure's IPv4 stack as well, which is even more sad. Similarly to you, I had to report to them that their VPN tunnels only send PMTUD in one direction, so you get this wonderful experience where TCP streams with big packets work in one direction, but not the other! With most ACK packets being small, this can take a surprising amount of time to discover and troubleshoot. |
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