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Hi Kary, thanks for the video!
It’s interesting also that further in the trace sender actually started using TSO (64512 Bytes TCP segment length).
And throughout all the trace receiver acknowledged every 5120-Bytes chunk (which is 512×10) using one ACK only.
You mention the DF Bit and explain that any intermediate device dropping that packet should send an ICMP unreachable.
This is only the case if the intermediate device is acting as L3. This appears to be a misconfiguration on the switching layer, especially given the source and destination addresses being within the same subnet.
Dave
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Even the srcIP and dstIP are in the same subnet, it is still possible that the packets traverse the L3 overlay network via tunneling like VxLAN. So packets are dropped by spine routers which have no idea about the end hosts, so no ICMP unreachable messages.
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Great video, thanks for putting out videos that aren’t boring. No disrespect to the WCNA website and its required learning credits but my gosh do they make me tired.
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