Ah, I see what you mean there; I used the following filter in Wireshark:
udp.dstport == 25305 or udp.srcport == 25305
This is not the behavior I saw if the TFTP request is answered in a
timely manner, so I suspect that the long delay between the initial
request and the answer is causing the timeouts to occur in the TFTP
code, which causes this separate "stacked OACK" bug.
By the time the "stacked OACKs" are sent, it's been over one minute, and
the client isn't listening for a reply any more. So yes, "stacked OACKs"
are a real bug, but right now I think they're just distracting from the
root cause (the long delay).
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https://bugs.launchpad.net/bugs/1743249
Title:
Failed Deployment after timeout trying to retrieve grub cfg
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