Packet dump from machine A where you can see step (3) and (4).
ICMPv6.pcap (application/octet-stream), 742 bytes, created by Jiri Popelka on 2012-03-22 17:16:36 UTC
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Creator: Jiri Popelka
Created: 2012-03-22 17:16:36 UTC
Size: 742 bytes

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Attachments on bug 806017: 572041