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1.我用本地的DNS218.108.248.200,解析www.zucc.edu.cn,无法解析;
[guest@fc ~]$ dig www.zucc.edu.cn
; <<>;>; DiG 9.2.4 <<>;>; www.zucc.edu.cn
;; global options: printcmd
;; connection timed out; no servers could be reached
2.但是用北京的一台DNS(202.106.0.20,据说是北京电信的),直接dig可以解析出来;加+trace以后就不行了
[guest@fc ~]$ cat /etc/resolv.conf
#nameserver 218.108.248.200
nameserver 202.106.0.20
#nameserver 202.96.0.133
[guest@fc ~]$ dig www.zucc.edu.cn
; <<>;>; DiG 9.2.4 <<>;>; www.zucc.edu.cn
;; global options: printcmd
;; Got answer:
;; ->;>;HEADER<<- opcode: QUERY, status: NOERROR, id: 51388
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 1
;; QUESTION SECTION:
;www.zucc.edu.cn. IN A
;; ANSWER SECTION:
www.zucc.edu.cn. 10800 IN A 211.90.238.141
;; AUTHORITY SECTION:
zucc.edu.cn. 3436 IN NS dnsse.zucc.edu.cn.
zucc.edu.cn. 3436 IN NS dns.zucc.edu.cn.
;; ADDITIONAL SECTION:
dns.zucc.edu.cn. 4352 IN A 210.32.64.8
;; Query time: 2679 msec
;; SERVER: 202.106.0.20#53(202.106.0.20)
;; WHEN: Sun Sep 25 00:13:33 2005
;; MSG SIZE rcvd: 103
[guest@fc ~]$ dig www.zucc.edu.cn +trace
; <<>;>; DiG 9.2.4 <<>;>; www.zucc.edu.cn +trace
;; global options: printcmd
. 259302 IN NS D.ROOT-SERVERS.NET.
. 259302 IN NS E.ROOT-SERVERS.NET.
. 259302 IN NS F.ROOT-SERVERS.NET.
. 259302 IN NS G.ROOT-SERVERS.NET.
. 259302 IN NS H.ROOT-SERVERS.NET.
. 259302 IN NS I.ROOT-SERVERS.NET.
. 259302 IN NS J.ROOT-SERVERS.NET.
. 259302 IN NS K.ROOT-SERVERS.NET.
. 259302 IN NS L.ROOT-SERVERS.NET.
. 259302 IN NS M.ROOT-SERVERS.NET.
. 259302 IN NS A.ROOT-SERVERS.NET.
. 259302 IN NS B.ROOT-SERVERS.NET.
. 259302 IN NS C.ROOT-SERVERS.NET.
;; Received 228 bytes from 202.106.0.20#53(202.106.0.20) in 43 ms
cn. 172800 IN NS NS.CNC.AC.cn.
cn. 172800 IN NS DNS2.CNNIC.NET.cn.
cn. 172800 IN NS NS.CERNET.NET.
cn. 172800 IN NS DNS3.CNNIC.NET.cn.
cn. 172800 IN NS DNS4.CNNIC.NET.cn.
cn. 172800 IN NS DNS5.CNNIC.NET.cn.
;; Received 322 bytes from 128.8.10.90#53(D.ROOT-SERVERS.NET) in 7060 ms
edu.cn. 172800 IN NS dns2.edu.cn.
edu.cn. 172800 IN NS deneb.dfn.de.
edu.cn. 172800 IN NS dns.edu.cn.
edu.cn. 172800 IN NS ns2.cuhk.hk.
edu.cn. 172800 IN NS ns2.cernet.net.
;; Received 285 bytes from 159.226.1.1#53(NS.CNC.AC.cn) in 27 ms
zucc.edu.cn. 172800 IN NS DNS.zucc.edu.cn.
zucc.edu.cn. 172800 IN NS DNSSE.zucc.edu.cn.
;; Received 103 bytes from 202.112.0.13#53(dns2.edu.cn) in 3903 ms
;; connection timed out; no servers could be reached
3.还有一点疑问,现在北京的DNS是多少?<看置顶的帖子里面北京电信应该是202.106.0.133,不过也没有解析出来>;
根据前两点,朋友们是否可以帮忙分析一下,我想可能是对方权威DNS(DNS.zucc.edu.cn\DNSSE.zucc.edu.cn)出了问题或者所处的网络我这里不可达,202.106.0.20可以解析是因为它有相关缓存,并且还没有到期,不知道对不对?还有没有其他可能? |
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