<meta http-equiv="Content-Type" content="text/html; charset=GB18030"><div><br></div><div><div style="font-family: "lucida Grande", Verdana, "Microsoft YaHei";">dear admin:</div><div style="font-family: "lucida Grande", Verdana, "Microsoft YaHei"; position: relative;"><div style="position: relative;"><div>  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</div><div>  please give me some example,or document , or google links to learn about it ;</div><div>  thanks!</div></div></div></div><div><hr align="left" style="margin: 0 0 10px 0;border: 0;border-bottom:1px solid #E4E5E6;height:0;line-height:0;font-size:0;padding: 20px 0 0 0;width: 50px;"><div style="font-size:14px;font-family:Verdana;color:#000;"><a class="xm_write_card" id="in_alias" style="white-space: normal; display: inline-block; text-decoration: none !important;font-family: -apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei;" href="https://wx.mail.qq.com/home/index?t=readmail_businesscard_midpage&nocheck=true&name=Yang&icon=http%3A%2F%2Fthirdqq.qlogo.cn%2Fg%3Fb%3Dsdk%26k%3DQCkTfUibqnEM6qRuG2lPLNA%26s%3D100%26t%3D1556340979%3Frand%3D1639145287&mail=395096713%40qq.com&code=" target="_blank"><table style="white-space: normal;table-layout: fixed; padding-right: 20px;" contenteditable="false" cellpadding="0" cellspacing="0"><tbody><tr valign="top"><td style="width: 40px;min-width: 40px; padding-top:10px"><div style="width: 38px; height: 38px; border: 1px #FFF solid; border-radius:50%; margin: 0;vertical-align: top;box-shadow: 0 0 10px 0 rgba(127,152,178,0.14);"><img src="http://thirdqq.qlogo.cn/g?b=sdk&k=QCkTfUibqnEM6qRuG2lPLNA&s=100&t=1556340979?rand=1639145287" style="width:100%;height:100%;border-radius:50%;pointer-events: none;"></div></td><td style="padding: 10px 0 8px 10px;"><div class="businessCard_name" style="font-size: 14px;color: #33312E;line-height: 20px; padding-bottom: 2px; margin:0;font-weight: 500;">Yang</div><div class="businessCard_mail" style="font-size: 12px;color: #999896;line-height: 18px; margin:0;">395096713@qq.com</div></td></tr></tbody></table></a></div></div>