Date: Tue, 12 Feb 2008 17:31:57 -0800 From: Xin LI <delphij@delphij.net> To: freebsd-net@freebsd.org Cc: ume@FreeBSD.org Subject: Strange resolver behavior Message-ID: <47B2488D.70707@delphij.net>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi, It looks like that certain (mis)configuration by the baidu.com DNS administrators has caused this, but I have no clue why our resolver would return NXDOMAIN after it gets a positive response? (Yes, I know that _ is not appropriate for domain names :) [delphij@charlie] ~> host -a dict.baidu.com Trying "dict.baidu.com" ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59711 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 0 ;; QUESTION SECTION: ;dict.baidu.com. IN ANY ;; ANSWER SECTION: dict.baidu.com. 7153 IN CNAME ps_other.a.shifen.com. ;; AUTHORITY SECTION: baidu.com. 159107 IN NS ns4.baidu.com. baidu.com. 159107 IN NS ns2.baidu.com. baidu.com. 159107 IN NS ns3.baidu.com. baidu.com. 159107 IN NS dns.baidu.com. Received 136 bytes from 127.0.0.1#53 in 31 ms [delphij@charlie] ~> host -a ps_other.a.shifen.com Trying "ps_other.a.shifen.com" ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 64825 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 0 ;; QUESTION SECTION: ;ps_other.a.shifen.com. IN ANY ;; ANSWER SECTION: ps_other.a.shifen.com. 1113 IN A 202.108.22.46 ;; AUTHORITY SECTION: a.shifen.com. 72679 IN NS ns3.a.shifen.com. a.shifen.com. 72679 IN NS ns2.a.shifen.com. a.shifen.com. 72679 IN NS ns4.a.shifen.com. a.shifen.com. 72679 IN NS ns1.a.shifen.com. Received 127 bytes from 127.0.0.1#53 in 0 ms [delphij@charlie] ~> host ps_other.a.shifen.com ps_other.a.shifen.com has address 202.108.22.46 Host ps_other.a.shifen.com not found: 3(NXDOMAIN) Cheers, - -- Xin LI <delphij@delphij.net> http://www.delphij.net/ FreeBSD - The Power to Serve! -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4 (FreeBSD) iD8DBQFHskiNi+vbBBjt66ARAhO0AKCI64gr+oNw7j8/TcL51b7vw1PReQCeMRE1 RaI38+YYtloZuSc0L0BDF2M= =ONkQ -----END PGP SIGNATURE-----
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