[help]how to configure ecs subnet for bind-9.18-21

[Yang]

dear admin:
  now, i use bind-9.18-21, i want to use ecs client subnet function; but i don't know how to configure it, and i don't get method from google
  please give me some example,or document , or google links to learn about it ;
  thanks!





Yang
395096713 at qq.com
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