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While testing this patch against the Intel NICs we have, I've detected 
that upon port start and stopping two ICMPv6 packets are sent out. This 
has caused these packets to appear in the first capture, causing it to 
intermittently fail if they were the first packets to arrive or not. 
Sometimes the ICMPv6 packets would be the only ones to show in the 
captured packets. This problem is not strictly related to this patch but 
could be fixed if not too annoying.

So far what appears to have fixed the issue on my side, was just add 
some wait between port setup and the sending of the packets.
time.sleep(2) seems to have done the job. But it may not be an ideal 
solution.