Sorry, I don't speak Japanese but I'll respond in English. IPv6 support on MX is very limited at the moment: "Cisco Meraki security appliances can pass IPv6 traffic in pass-through mode, but no traffic analysis or manipulation is possible when using IPv6. At this time, IPv6 traffic cannot be routed or passed along a VPN tunnel." Source: https://documentation.meraki.com/zGeneral_Administration/Other_Topics/IPv6_Device_Compatibility To keep up-to-date about IPv6 support, subscribe to this topic: https://community.meraki.com/t5/Full-Stack-Network-Wide/IPv6-Meraki/m-p/53677
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