<div dir="ltr"><p style="color:rgb(0,0,0);font-family:Arial;font-size:14px;margin:0px"><span style="font-family:"Microsoft Yahei";font-size:16px">Hi,</span></p><div style="color:rgb(0,0,0);font-family:Arial;font-size:14px;margin:0px"><span style="font-family:"Microsoft Yahei";font-size:16px"><br></span></div><div style="color:rgb(0,0,0);font-family:Arial;font-size:14px;margin:0px"><span style="font-family:"Microsoft Yahei";font-size:16px">We are encountering a problem that SOA records had data residue when deleting a new-created zone with BIND 9. The operation procedures are as below:</span></div><div style="color:rgb(0,0,0);font-family:Arial;font-size:14px;margin:0px"><span style="font-family:"Microsoft Yahei";font-size:16px"><br></span></div><p style="color:rgb(0,0,0);font-family:Arial;font-size:14px;margin:0px"><span style="font-family:"Microsoft Yahei";font-size:16px">1. Firstly, a zone named <a href="http://test18.cn/" target="_blank">test18.cn</a> was added with BIND 9. The command "dig -t SOA <a href="http://test18.cn">test18.cn</a>" shows the corresponding SOA record was created successfully.</span></p><p style="color:rgb(0,0,0);font-family:Arial;font-size:14px;margin:0px"><span style="font-family:"Microsoft Yahei";font-size:16px">2. Secondly, RNDC command "rndc -s 127.0.0.1 -p  953  -k  /etc/rndc.key  delzone  </span><a href="http://test18.cn/" target="_blank" style="font-family:"Microsoft Yahei";font-size:16px">test18.cn</a><span style="font-family:"Microsoft Yahei";font-size:16px">" was applied to remove zone "</span><a href="http://test18.cn/" target="_blank" style="font-family:"Microsoft Yahei";font-size:16px">test18.cn</a><span style="font-family:"Microsoft Yahei";font-size:16px">".</span><span style="font-family:"Microsoft Yahei";font-size:16px"><br></span></p><p style="color:rgb(0,0,0);font-family:Arial;font-size:14px;margin:0px"><span style="font-family:"Microsoft Yahei";font-size:16px">3. After a few of minutes, "dig -t SOA  </span><a href="http://test18.cn/" target="_blank" style="font-family:"Microsoft Yahei";font-size:16px">test18.cn</a><span style="font-family:"Microsoft Yahei";font-size:16px">" was applied again and found the SOA record still existed.</span><span style="font-family:"Microsoft Yahei";font-size:16px"><br></span></p><p style="color:rgb(0,0,0);font-family:Arial;font-size:14px;margin:0px"><span style="font-family:"Microsoft Yahei";font-size:16px"><br></span></p><p style="color:rgb(0,0,0);font-family:Arial;font-size:14px;margin:0px"><span style="font-family:"Microsoft Yahei";font-size:16px">The BIND version is 9.11.4-P2-RedHat-9.11.4-16.P2.el7. The problem occurred from time to time. Unfortunately, the logging file "name.run" does not record any abnormal information.</span></p><div style="color:rgb(0,0,0);font-family:Arial;font-size:14px;margin:0px"><br></div><div style="color:rgb(0,0,0);font-family:Arial;font-size:14px;margin:0px"><br></div><p style="color:rgb(0,0,0);font-family:Arial;font-size:14px;margin:0px"><span style="font-family:"Microsoft Yahei";font-size:16px">Any comments or suggestions will be highly appreciated.</span></p><p style="color:rgb(0,0,0);font-family:Arial;font-size:14px;margin:0px"><br></p><div style="color:rgb(0,0,0);font-family:Arial;font-size:14px;margin:0px"><span style="font-size:16px;font-family:"Microsoft Yahei"">Best Regards,</span></div><div style="color:rgb(0,0,0);font-family:Arial;font-size:14px;margin:0px"><span style="font-size:16px;font-family:"Microsoft Yahei"">Tengfei</span></div></div>