Please keep your replies on-list. This should help you understand its purpose: https://datatracker.ietf.org/doc/rfc9156/
Cheers, Greg On Mon, 31 Mar 2025 at 11:12, Champion Xie <xiejiel...@gmail.com> wrote: > Thank you for your information > by the way how to implement QNAME minimisation with domain names starting > with an underscore > > Greg Choules <gregchoules+bindus...@googlemail.com> 于2025年3月31日周一 18:01写道： > >> Hello. >> 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. >> >> 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. >> >> cheers, Greg >> >> On Mon, 31 Mar 2025 at 10:47, Champion Xie <xiejiel...@gmail.com> wrote: >> >>> >>> [root@rancher03 ~]# dig @localhost www.baidu.com a >>> >>> ; <<>> DiG 9.14.12 <<>> @localhost www.baidu.com a >>> ; (2 servers found) >>> ;; global options: +cmd >>> ;; Got answer: >>> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 35287 >>> ;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1 >>> >>> ;; OPT PSEUDOSECTION: >>> ; EDNS: version: 0, flags:; udp: 4096 >>> ; COOKIE: 74f8bc0ee313592d6a463b2f67ea63d442364be432ee42b2 (good) >>> ;; QUESTION SECTION: >>> ;www.baidu.com. IN A >>> >>> ;; ANSWER SECTION: >>> www.baidu.com. 1200 IN CNAME www.a.shifen.com. >>> www.a.shifen.com. 120 IN A 110.242.70.57 >>> www.a.shifen.com. 120 IN A 110.242.69.21 >>> >>> ;; Query time: 2507 msec >>> ;; SERVER: *127.0.0.1#53(127.0.0.1)* >>> ;; WHEN: Mon Mar 31 17:43:48 CST 2025 >>> ;; MSG SIZE rcvd: 132 >>> >>> >>> 31-Mar-2025 17:38:31.326 address not available resolving '_.com/A/IN': >>> 2801:1b8:10::b#53 >>> 31-Mar-2025 17:38:31.326 address not available resolving '_.com/A/IN': >>> 2001:500:2f::f#53 >>> 31-Mar-2025 17:38:31.331 address not available resolving '_. >>> baidu.com/A/IN': 2001:503:83eb::30#53 >>> 31-Mar-2025 17:38:31.331 address not available resolving '_. >>> baidu.com/A/IN': 2001:502:8cc::30#53 >>> 31-Mar-2025 17:38:31.331 address not available resolving '_. >>> baidu.com/A/IN': 2001:500:d937::30#53 >>> 31-Mar-2025 17:38:31.331 address not available resolving '_. >>> baidu.com/A/IN': 2001:501:b1f9::30#53 >>> 31-Mar-2025 17:38:31.331 address not available resolving '_. >>> baidu.com/A/IN': 2001:503:231d::2:30#53 >>> 31-Mar-2025 17:38:31.331 address not available resolving '_. >>> baidu.com/A/IN': 2001:503:a83e::2:30#53 >>> 31-Mar-2025 17:38:31.332 address not available resolving '_. >>> baidu.com/A/IN': 2001:503:eea3::30#53 >>> 31-Mar-2025 17:38:31.332 address not available resolving '_. >>> baidu.com/A/IN': 2001:503:d2d::30#53 >>> 31-Mar-2025 17:38:31.332 address not available resolving '_. >>> baidu.com/A/IN': 2001:502:7094::30#53 >>> 31-Mar-2025 17:38:31.332 address not available resolving '_. >>> baidu.com/A/IN': 2001:500:856e::30#53 >>> 31-Mar-2025 17:38:31.332 address not available resolving '_. >>> baidu.com/A/IN': 2001:502:1ca1::30#53 >>> 31-Mar-2025 17:38:31.332 address not available resolving '_. >>> baidu.com/A/IN': 2001:503:d414::30#53 >>> 31-Mar-2025 17:38:31.333 address not available resolving '_. >>> baidu.com/A/IN': 2001:503:39c1::30#53 >>> 31-Mar-2025 17:38:32.120 address not available resolving ' >>> www.baidu.com/A/IN': 240e:940:603:4:0:ff:b01b:589a#53 >>> 31-Mar-2025 17:38:32.120 address not available resolving ' >>> www.baidu.com/A/IN': 240e:bf:b801:1002:0:ff:b024:26de#53 >>> 31-Mar-2025 17:38:32.124 address not available resolving ' >>> ns3.baidu.com/AAAA/IN': 2001:501:b1f9::30#53 >>> 31-Mar-2025 17:38:32.125 address not available resolving ' >>> ns3.baidu.com/AAAA/IN': 2001:502:1ca1::30#53 >>> 31-Mar-2025 17:38:33.863 address not available resolving ' >>> www.a.shifen.com/A/IN': 240e:bf:b801:1006:0:ff:b04f:346b#53 >>> 31-Mar-2025 17:38:34.803 address not available resolving ' >>> ns1.a.shifen.com/AAAA/IN': 240e:940:603:a:0:ff:b08d:239d#53 >>> >>> -- >>> Best Regards!! >>> champion_xie >>> -- >>> Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe >>> from this list >>> >>> ISC funds the development of this software with paid support >>> subscriptions. Contact us at https://www.isc.org/contact/ for more >>> information. >>> >>> >>> bind-users mailing list >>> bind-users@lists.isc.org >>> https://lists.isc.org/mailman/listinfo/bind-users >>> >> > > -- > Best Regards!! > champion_xie >
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