<div dir="ltr"><div>Please keep your replies on-list.</div>This should help you understand its purpose: <a href="https://datatracker.ietf.org/doc/rfc9156/">https://datatracker.ietf.org/doc/rfc9156/</a><div><br></div><div>Cheers, Greg</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Mon, 31 Mar 2025 at 11:12, Champion Xie <<a href="mailto:xiejieling@gmail.com">xiejieling@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="ltr">Thank you for your information <div>by the way how to implement QNAME minimisation with domain names starting with an underscore </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Greg Choules <<a href="mailto:gregchoules%2Bbindusers@googlemail.com" target="_blank">gregchoules+bindusers@googlemail.com</a>> 于2025年3月31日周一 18:01写道：<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hello.<div>The underscore character was an old method for performing QNAME minimisation. Look in the CHANGES file for a note about it and the ARM for more detailed information.</div><div><br></div><div>BIND 9.14 is five years old and has been unsupported for a long time. Please update to 9.18 or 9.20, which contain many improvements, bug and security fixes.</div><div><br></div><div>cheers, Greg</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, 31 Mar 2025 at 10:47, Champion Xie <<a href="mailto:xiejieling@gmail.com" target="_blank">xiejieling@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><br clear="all"></div><div>[root@rancher03 ~]# dig @localhost <a href="http://www.baidu.com" target="_blank">www.baidu.com</a> a<br><br>; <<>> DiG 9.14.12 <<>> @localhost <a href="http://www.baidu.com" target="_blank">www.baidu.com</a> a<br>; (2 servers found)<br>;; global options: +cmd<br>;; Got answer:<br>;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 35287<br>;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1<br><br>;; OPT PSEUDOSECTION:<br>; EDNS: version: 0, flags:; udp: 4096<br>; COOKIE: 74f8bc0ee313592d6a463b2f67ea63d442364be432ee42b2 (good)<br>;; QUESTION SECTION:<br>;<a href="http://www.baidu.com" target="_blank">www.baidu.com</a>. IN A<br><br>;; ANSWER SECTION:<br><a href="http://www.baidu.com" target="_blank">www.baidu.com</a>. 1200 IN CNAME <a href="http://www.a.shifen.com" target="_blank">www.a.shifen.com</a>.<br><a href="http://www.a.shifen.com" target="_blank">www.a.shifen.com</a>. 120 IN A 110.242.70.57<br><a href="http://www.a.shifen.com" target="_blank">www.a.shifen.com</a>. 120 IN A 110.242.69.21<br><br>;; Query time: 2507 msec<br>;; SERVER: <b>127.0.0.1#53(127.0.0.1)</b><br>;; WHEN: Mon Mar 31 17:43:48 CST 2025<br>;; MSG SIZE rcvd: 132<br></div><div><br></div><div><br></div><div>31-Mar-2025 17:38:31.326 address not available resolving '_.com/A/IN': 2801:1b8:10::b#53<br>31-Mar-2025 17:38:31.326 address not available resolving '_.com/A/IN': 2001:500:2f::f#53<br>31-Mar-2025 17:38:31.331 address not available resolving '_.<a href="http://baidu.com/A/IN" target="_blank">baidu.com/A/IN</a>': 2001:503:83eb::30#53<br>31-Mar-2025 17:38:31.331 address not available resolving '_.<a href="http://baidu.com/A/IN" target="_blank">baidu.com/A/IN</a>': 2001:502:8cc::30#53<br>31-Mar-2025 17:38:31.331 address not available resolving '_.<a href="http://baidu.com/A/IN" target="_blank">baidu.com/A/IN</a>': 2001:500:d937::30#53<br>31-Mar-2025 17:38:31.331 address not available resolving '_.<a href="http://baidu.com/A/IN" target="_blank">baidu.com/A/IN</a>': 2001:501:b1f9::30#53<br>31-Mar-2025 17:38:31.331 address not available resolving '_.<a href="http://baidu.com/A/IN" target="_blank">baidu.com/A/IN</a>': 2001:503:231d::2:30#53<br>31-Mar-2025 17:38:31.331 address not available resolving '_.<a href="http://baidu.com/A/IN" target="_blank">baidu.com/A/IN</a>': 2001:503:a83e::2:30#53<br>31-Mar-2025 17:38:31.332 address not available resolving '_.<a href="http://baidu.com/A/IN" target="_blank">baidu.com/A/IN</a>': 2001:503:eea3::30#53<br>31-Mar-2025 17:38:31.332 address not available resolving '_.<a href="http://baidu.com/A/IN" target="_blank">baidu.com/A/IN</a>': 2001:503:d2d::30#53<br>31-Mar-2025 17:38:31.332 address not available resolving '_.<a href="http://baidu.com/A/IN" target="_blank">baidu.com/A/IN</a>': 2001:502:7094::30#53<br>31-Mar-2025 17:38:31.332 address not available resolving '_.<a href="http://baidu.com/A/IN" target="_blank">baidu.com/A/IN</a>': 2001:500:856e::30#53<br>31-Mar-2025 17:38:31.332 address not available resolving '_.<a href="http://baidu.com/A/IN" target="_blank">baidu.com/A/IN</a>': 2001:502:1ca1::30#53<br>31-Mar-2025 17:38:31.332 address not available resolving '_.<a href="http://baidu.com/A/IN" target="_blank">baidu.com/A/IN</a>': 2001:503:d414::30#53<br>31-Mar-2025 17:38:31.333 address not available resolving '_.<a href="http://baidu.com/A/IN" target="_blank">baidu.com/A/IN</a>': 2001:503:39c1::30#53<br>31-Mar-2025 17:38:32.120 address not available resolving '<a href="http://www.baidu.com/A/IN" target="_blank">www.baidu.com/A/IN</a>': 240e:940:603:4:0:ff:b01b:589a#53<br>31-Mar-2025 17:38:32.120 address not available resolving '<a href="http://www.baidu.com/A/IN" target="_blank">www.baidu.com/A/IN</a>': 240e:bf:b801:1002:0:ff:b024:26de#53<br>31-Mar-2025 17:38:32.124 address not available resolving '<a href="http://ns3.baidu.com/AAAA/IN" target="_blank">ns3.baidu.com/AAAA/IN</a>': 2001:501:b1f9::30#53<br>31-Mar-2025 17:38:32.125 address not available resolving '<a href="http://ns3.baidu.com/AAAA/IN" target="_blank">ns3.baidu.com/AAAA/IN</a>': 2001:502:1ca1::30#53<br>31-Mar-2025 17:38:33.863 address not available resolving '<a href="http://www.a.shifen.com/A/IN" target="_blank">www.a.shifen.com/A/IN</a>': 240e:bf:b801:1006:0:ff:b04f:346b#53<br>31-Mar-2025 17:38:34.803 address not available resolving '<a href="http://ns1.a.shifen.com/AAAA/IN" target="_blank">ns1.a.shifen.com/AAAA/IN</a>': 240e:940:603:a:0:ff:b08d:239d#53<br></div><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div>Best Regards!!</div>
<div>champion_xie</div></div></div>
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</blockquote></div><div><br clear="all"></div><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div>Best Regards!!</div>
<div>champion_xie</div></div>
</blockquote></div>