Thank you very much for replying.
I don't believe the outputs are indicative of any problem with your CPE. I think its telling the truth when it shows no packets in from Zen in the below test. I certainly don't see them on the wire on the link between the CPE and my router. I think we would be wasting the time of your CPE development team by asking them to take a look at it before your networks team can prove it to be a CPE issue.
The packets are dropped somewhere between the outside of the TG589VN up to and including the first hop in Zen.
I ran some more testing last night where I set up a capture on a web server and repeated the same tests. Packets get from my router to the web server fine. The web server responds with an ICMPv6 echo reply, but this reply never makes it back to the outside interface on my TG589VN.
If I alter the packets to be much larger (say 1400 bytes) they go through fine. If I change the data in the payload of the ping packet, some data patterns go through fine.
So in summary:
The fault is between outside of TG589 CPE up to and including Zen first hop. Only in Zen to CPE direction. It affects only IPv6 packets. If the packet size, destination address or data pattern is varied then this affects if the packets pass. Larger packets are more likely to pass without issue.
I can provide more detail on any of these points if required and can also share the reference for my email trail with Zen which has an abundance of outputs and packet captures.
Edited by PacketNerd (Mon 15-Feb-16 21:30:47)