I repeated the tests with LANIC HW features Large ReceiveO ffload and TCP
Segmentation Offload
turned OFF.
Now the IPv4 packets are stable with MTU=1500 and TCP MSS=1460 in a broadcast
domain.
the IPv4 packets up to 64KiB are caused by the HW features of LANIC and not by
pathMTU algorithm.
you
** Attachment added: "screenshopt of wireshark and iperf3 server console"
https://bugs.launchpad.net/ubuntu/+source/kernel-package/+bug/1953030/+attachment/5544913/+files/tcp_mtu_probe_ceiling.png
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