BuddyNS delegation lab
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Color | Indication | Color | Indication | Color | Indication |
---|---|---|---|---|---|
Zone. | Nameserver serving outdated data. | Nameserver from the BuddyNS backbone. | |||
Nameserver delegated by zone. | Server was queried and timed out. | Inconsistency between zone and registry. |
Geographical distribution of the Authority servers
Location | Server |
---|
Geographical locations are established via MaxMind's GeoLite technology. Some locations may be inexact.
Resolution completed
The DNS resolution trace from root DNS servers down to your authority completed successfully. Each server on the chain answered as expected.
See below for a detailed diagnostic of the delegation chain.
Delegation tests for qmail.jp
Test | Result | Notes |
---|---|---|
Is Zone | OK | The indicated domain qmail.jp is a zone:
authority and nameserver data is announced for
it.
These are the authority parameters for zone qmail.jp :
|
Zone/Registry consistent | OK | The list of nameservers declared by the last delegating server and the authoritative server match. Configuration looks healthy. |
Authoritative servers consistent | ERROR | Authoritative nameservers for qmail.jp are
serving inconsistent data. Clients may be confused by
getting different answers depending on what destination
nameserver they reached. The outdated zone data some
nameservers are publishing may reference records
pointing clients to IP addresses no longer in control
of qmail.jp's organization, thus incurring data
and identity theft. Serial numbers are:
|
Number of servers | OK | qmail.jp delegates its DNS
to 3 servers. This is a sufficient
number to provide DNS continuity. RFC 2182 recommends 3 to 5
servers "when higher reliability is required": BuddyNS
recommends 4 or 5. |
Unresponsive nameservers | OK | All queried nameservers responded; no dead/misconfigured/unavailable server was found in the chosen resolution path. |
Recursion | OK | None of the DNS servers listed as
authoritative for qmail.jp serves recursive
queries to the public.
|
Truncation | OK | None of the DNS servers listed as
authoritative for qmail.jp gives a truncated
response for NS requests. Clients can successfully
perform NS queries over the low-latency UDP protocol,
without falling back to much slower TCP. |
IPv6 | WARNING | None of the servers serving
qmail.jp's DNS is reachable via IPv6.
IPv6-enabled clients qmail.jp will need
to revert to compatibility IPv4 protocol for every
look up of services of qmail.jp . A growing
number a IPv6-only clients will be unable to perform
such look ups.
IPv6 score: 0% |
DNSCurve | No | DNScurve is not supported for this zone. To leverage DNSCurve from BuddyNS, delegate qmail.jp using secure server names from BuddyNS. |
Delegation trace for qmail.jp
The delegation trace below is one of the possible traversals of the delegation tree. Note that:
- For zones with correct delegation, the same data is obtained regardless of which resolution path is traversed.
- BuddyNS excludes its own servers from traversals when foreign servers are available.
- Refresh this page to test with a different traversal path.
Here's the steps BuddyNS took to collect the DNS delegation chain for qmail.jp:
-
→ BuddyNS asks server k.root-servers.net.: "Which servers can answer to me about
qmail.jp
?"← Server k.root-servers.net. replied: "I can't tell you myself, but ask any one of the following guys:"
- a.dns.jp
- b.dns.jp
- c.dns.jp
- d.dns.jp
- e.dns.jp
- f.dns.jp
- g.dns.jp
- h.dns.jp
-
→ BuddyNS asks server a.dns.jp: "Which servers can answer to me about
qmail.jp
?"← Server a.dns.jp replied: "I can't tell you myself, but ask any one of the following guys:"
- b.ns.qmail.jp
- a.ns.qmail.jp
- d.ns.qmail.jp
-
👍🏻 Found it! Server
a.ns.qmail.jp
is authoritative for zoneqmail.jp
!← It declares the following nameservers as authorities for
qmail.jp
:- a.ns.qmail.jp
- b.ns.qmail.jp
- d.ns.qmail.jp