[FS#1501] DS-Lite is broken on snapshot with some models

[LEDE Bugs]

The following task has a new comment added:

FS#1501 - DS-Lite is broken on snapshot with some models
User who did this - Hans Dedecker (dedeckeh)

----------
Thanks for providing the requested traces; unfortunately I can't find any indication to the observed problem as the iptables packet counters show the expected values while the interface status is as expected.
Would you be able to run tcpdump on eth1.2 (tcpdump -i eth1.2 -vvv)? I would like to check if we see IPv6 packets containing the ping request on the wan device.
----------

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1501#comment4733