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



Your delegation records return two name servers that resolve to the same IPv4 address. You can't expect this to work well, but it is hopeless when the IPv4 address is unreachable, and the IPv6 addresses (although they resolve the name server names) return REFUSED for the seacom.mu zone.

Get a working IPv4 address (or remove it) and add the seacom.mu zone to the IPv6 name servers.

$ dig +trace seacom.mu | tail -7
; Received 643 bytes from 199.7.83.42#53(l.root-servers.net) in 11 ms

seacom.mu. 43200 IN NS ns4.seacomnet.com.
seacom.mu. 43200 IN NS ns3.seacomnet.com.
;; Received 87 bytes from 204.61.216.10#53(udns1.tld.mu) in 4 ms

;; connection timed out; no servers could be reached

$ checkdelegation seacomnet.com
parent zone com:
seacomnet.com. 172800 NS ns3.seacomnet.com.
seacomnet.com. 172800 NS ns4.seacomnet.com.
ns3.seacomnet.com. 172800 AAAA 2c0f:feb0::3
ns3.seacomnet.com. 172800 A 41.87.126.253
ns4.seacomnet.com. 172800 AAAA 2c0f:feb0::4
ns4.seacomnet.com. 172800 A 41.87.127.253

$ dig ns3.seacomnet.com. @41.87.126.253

; <<>> DiG 9.10.6 <<>> ns3.seacomnet.com. @41.87.126.253
;; global options: +cmd
;; connection timed out; no servers could be reached

$ dig +short ns3.seacomnet.com. @2c0f:feb0::4
41.87.126.253

$ dig AAAA +short ns4.seacomnet.com. @2c0f:feb0::3
2c0f:feb0::4

$ dig +nostats seacomnet.mu @2c0f:feb0::4

; <<>> DiG 9.10.6 <<>> +nostats seacomnet.mu @2c0f:feb0::4
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 17433
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

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

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