[dns-operations] most of root NS and com's NS fail from here

[Ken Peng]

Thanks for all your helps. The dig for version.bind and hostname.bind 
sometime works, sometime not. as you see:

pyh at dwdns153:~$ dig txt chaos version.bind @h.root-servers.net

; <<>> DiG 9.6.1-P2 <<>> txt chaos version.bind @h.root-servers.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21537
;; flags: qr rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;version.bind.                  CH      TXT

;; ANSWER SECTION:
version.bind.           0       CH      TXT     "NSD 4.0.3"

;; Query time: 257 msec
;; SERVER: 128.63.2.53#53(128.63.2.53)
;; WHEN: Wed Apr 30 09:02:23 2014
;; MSG SIZE  rcvd: 52

pyh at dwdns153:~$ dig txt chaos hostname.bind @h.root-servers.net

; <<>> DiG 9.6.1-P2 <<>> txt chaos hostname.bind @h.root-servers.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29675
;; flags: qr rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;hostname.bind.                 CH      TXT

;; ANSWER SECTION:
hostname.bind.          0       CH      TXT     "003.nzy.h.root-servers.org"

;; Query time: 256 msec
;; SERVER: 128.63.2.53#53(128.63.2.53)
;; WHEN: Wed Apr 30 09:02:37 2014
;; MSG SIZE  rcvd: 70

pyh at dwdns153:~$
pyh at dwdns153:~$
pyh at dwdns153:~$ dig txt chaos version.bind @h.root-servers.net +short

; <<>> DiG 9.6.1-P2 <<>> txt chaos version.bind @h.root-servers.net +short
;; global options: +cmd
;; connection timed out; no servers could be reached
pyh at dwdns153:~$
pyh at dwdns153:~$
pyh at dwdns153:~$ dig txt chaos version.bind @h.root-servers.net +short

; <<>> DiG 9.6.1-P2 <<>> txt chaos version.bind @h.root-servers.net +short
;; global options: +cmd
;; connection timed out; no servers could be reached


And this is the mtr info for h.root-servers.net:

pyh at dwdns153:~$ mtr h.root-servers.net --report
HOST: dwdns153.dns.yt.yygamedev.c Loss%   Snt   Last   Avg  Best  Wrst StDev
   1. 113.108.228.129              40.0%    10    0.5   0.5   0.5   0.8 
   0.1
   2. 121.14.46.93                 10.0%    10    0.5   0.5   0.5   0.5 
   0.0
   3. 121.14.37.33                  0.0%    10    2.7   3.3   1.6   7.2 
   1.9
   4. 121.14.37.6                   0.0%    10    0.4   0.4   0.3   0.7 
   0.1
   5. 121.14.50.13                  0.0%    10    1.5   2.3   0.9   4.3 
   1.2
   6. 113.108.208.97                0.0%    10    4.8   3.9   1.6   5.9 
   1.5
   7. 202.97.34.202                 0.0%    10    1.1   1.5   0.9   5.2 
   1.3
   8. 202.97.61.234                 0.0%    10    2.1   1.6   1.3   2.2 
   0.3
   9. 202.97.52.154                 0.0%    10  148.6 149.7 147.7 151.3 
   1.3
  10. 202.97.49.158                 0.0%    10  151.5 150.7 148.6 151.8 
   1.2
  11. 218.30.54.198                 0.0%    10  174.9 183.0 174.9 209.5 
   9.7
  12. los-edge-05.inet.qwest.net    0.0%    10  169.8 175.9 169.8 180.5 
   3.4
  13. 65-126-18-214.dia.static.qwe  0.0%    10  172.7 179.4 172.7 186.4 
   4.5
  14. 143.56.244.2                  0.0%    10  160.5 173.9 160.5 192.2 
  11.6
  15. ap-1-1-1-nd.level3-lax.core.  0.0%    10  160.7 167.6 160.1 173.4 
   4.7
  16. np-5-1-1-nd.sandiego.core.dr  0.0%    10  177.9 185.6 177.9 195.3 
   5.0
  17. 138.18.190.89                10.0%    10  163.8 172.2 163.8 178.3 
   4.4
  18. 138.18.190.114               10.0%    10  163.2 163.4 163.1 164.8 
   0.5
  19. 128.63.2.53                  10.0%    10  171.2 180.3 171.2 185.4 
   4.2

Regards.
Ken


于 2014-4-30 5:16, Warren Kumari 写道:
> Oh, sure, I totally agree NSID/hostname.bind etc. will be very helpful.
>>
>>My experience is that if these query hit a masquerading root node, you
>>mostly won't get an answer, by either no ANSWER section or empty string
>>in ANSWER section.