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[public-dns-discuss] Re: Failing to resolve seacom.mu domain from google public dns .



HI 
Thanks for the response 

ns3 and ns4 do not resolve to the same IP addresses. Please  notice that one is .126. and the other is .127. Please check and confirm this.

Secondly, can you do a  traceroute to our authoritative name servers to show us where packets could be getting filtered, if at all?  do this both on IPv4 and IPv6.


Proof to show that other networks are not affected apart from Google, below is the same query (that Google did and failed) from a server in Seattle, that is on a completely different network:

psg.com:/usr/home/mtinka> dig ns3.seacomnet.com. @41.87.126.253

; <<>> DiG 9.10.7 <<>> ns3.seacomnet.com. @41.87.126.253
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 26979
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 4
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;ns3.seacomnet.com.        IN    A

;; ANSWER SECTION:
ns3.seacomnet.com.    14400    IN    A    41.87.126.253

;; AUTHORITY SECTION:
seacomnet.com.        14400    IN    NS    ns3.seacomnet.com.
seacomnet.com.        14400    IN    NS    ns4.seacomnet.com.

;; ADDITIONAL SECTION:
ns4.seacomnet.com.    14400    IN    A    41.87.127.253
ns3.seacomnet.com.    14400    IN    AAAA    2c0f:feb0::3
ns4.seacomnet.com.    14400    IN    AAAA    2c0f:feb0::4

;; Query time: 134 msec
;; SERVER: 41.87.126.253#53(41.87.126.253)
;; WHEN: Sat May 19 14:43:18 UTC 2018
;; MSG SIZE  rcvd: 166

psg.com:/usr/home/mtinka>

I've also added some routing information from Seattle:

psg.com:/usr/home/mtinka> traceroute -I ns3.seacomnet.com
traceroute to ns3.seacomnet.com (41.87.126.253), 64 hops max, 48 byte packets
 1  r0.sea.rg.net (147.28.0.4)  0.166 ms  0.115 ms  0.116 ms
 2  ge-100-0-0-15.r05.sttlwa01.us.bb.gin.ntt.net (165.254.106.17)  0.478 ms  0.469 ms  0.476 ms
 3  * * *
 4  ae-0.r24.nycmny01.us.bb.gin.ntt.net (129.250.4.14)  72.604 ms *  72.507 ms
 5  ae-9.r24.londen12.uk.bb.gin.ntt.net (129.250.2.19)  138.366 ms  154.543 ms  138.307 ms
 6  ae-21.r00.londen10.uk.bb.gin.ntt.net (129.250.4.24)  136.548 ms  136.509 ms  136.357 ms
 7  213.130.48.218 (213.130.48.218)  136.007 ms  136.032 ms  136.000 ms
 8  ge-0-0-0.pr-02-lhr.uk.seacomnet.com (105.16.35.7)  136.129 ms  136.132 ms  136.107 ms
 9  ns3.seacomnet.com (41.87.126.253)  134.069 ms  133.968 ms  134.107 ms
psg.com:/usr/home/mtinka>

psg.com:/usr/home/mtinka> traceroute -I ns4.seacomnet.com
traceroute to ns4.seacomnet.com (41.87.127.253), 64 hops max, 48 byte packets
 1  r0.sea.rg.net (147.28.0.4)  0.119 ms  0.126 ms  0.119 ms
 2  ge-100-0-0-15.r05.sttlwa01.us.bb.gin.ntt.net (165.254.106.17)  0.539 ms  0.753 ms  0.468 ms
 3  ae-2.r22.sttlwa01.us.bb.gin.ntt.net (129.250.2.44)  0.624 ms  0.729 ms  1.353 ms
 4  ae-0.r24.nycmny01.us.bb.gin.ntt.net (129.250.4.14)  74.590 ms  82.656 ms  74.561 ms
 5  ae-9.r24.londen12.uk.bb.gin.ntt.net (129.250.2.19)  140.381 ms  156.709 ms  140.516 ms
 6  ae-21.r00.londen10.uk.bb.gin.ntt.net (129.250.4.24)  138.327 ms  138.662 ms  138.409 ms
 7  213.130.48.218 (213.130.48.218)  138.065 ms  138.078 ms  138.056 ms
 8  ge-0-0-1.pr-02-lhr.uk.seacomnet.com (105.16.34.7)  136.025 ms  136.024 ms  136.020 ms
 9  ns4.seacomnet.com (41.87.127.253)  138.289 ms  138.222 ms  138.402 ms
psg.com:/usr/home/mtinka>


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