After you enable IPv6, CDN can process requests from IPv6 clients and forward their IP addresses to your origin server.
Background information
Most Alibaba Cloud CDN points of presence (POPs) support IPv6. After you enable IPv6, clients connect to the nearest POP over IPv6 if that POP supports it.
For some domain names, IPv6 is disabled by default for regions outside the Chinese mainland to optimize performance. If you require IPv6 access outside the Chinese mainland, submit a ticket.
Procedure
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Log on to the CDN console.
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In the left navigation pane, click Domain Names.
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On the Domain Names page, find the target domain name and click Manage in the Actions column.
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In the Basics section, find the IPv6 switch.
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Turn on the IPv6 switch.
Once enabled, CDN can process requests from IPv6 clients and forward their IP addresses to your origin server.