IPv6 Pass through doesn't work when nat hardware acceleration turns on [AC68U]

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New Around Here
With asuswrt-merlin.ng version 384.10_2:

If the nat hardware acceleration turns on and IPv6 is set to Passthough, the system log was flood with :"kernel: osl_pktfastfree: free skb for NULL ctfpool". Network devices could get its own ipv4 & ipv6 address but cannot access to internet.

However, IPv6 passthrough works well when the nat hardware acceleration is set to off.

I have tested and verified this would happen on all version of merlin-ng till very lastest 384.10_2.

I have searched this topic and find a samilar case as https://www.snbforums.com/threads/ac66u-ipv6-dmz.38060/ , but it seems ending to using NAT acceleration is set to off - IPv6 passthrough.

Would someone please help to give some advices on this issue?

Thanks a lot!

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