IPV6 forwards FritzBox (DS-LITE) <-> OpenWrt <-> LAN machine

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@beralt85

On a side note:
ping ipv6.google.com from the OpenWRT itself works fine...

Since you can capture the ping from the OpenWrt, you should know which are the lan and wan interfaces of the Fritz.

@beralt85

I only find records of the hosts address in the "lan" packet dump, and they all look like the second screenshot I posted.

These are echo requests, the replies are missing.

@beralt85

The first four under "internet" don't show packages originating from the host.

This can be bad. The Fritz might be dropping the packets.
Also have a look here.