Ipv6 not passing through upstream on MACVLAN Debian NSPAWN container

[zs311521]

Describe the bug
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To Reproduce
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Even after enabling forwarding on interfaces, following the instructions, PING -6 google.com or other sites do not work.

AA records are resolved. IPV6 works internally across clients. MACVLAN is set up.

Can we set up bridge mode instead? For pi-hole like applications. Or, is there a way to get ipv6 working - or not in MACVLAN?

Expected behavior
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Screenshots
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UDM Information

• Variant [e.g. Dream Machine, Dream Machine Pro]
• Firmware Version: [e.g. 1.6.3, 1.7.2-rc4]
• Controller Version [e.g 5.14.9]

Additional context
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[cwildfoerster]

Any update? I have the same problem, can ping internal hosts back and forth, but cannot access the internet via ipv6. route -6 uses the configured next hop macvlan address of the udm.