intermittent resolving problem for some domains

[Daniel Dawalibi]

Hello

 

We are facing an intermittent resolving problems on several domains.  While
debugging the issue we found the below failures 

Can you please help?

Kindly note that the number of recursive clients is increasing during the
problem : recursive clients: 3700/14900/15000

 

1-      dig: couldn't get address for 'k.gtld-servers.net': failure

;; global options:  printcmd

.                       518011  IN      NS      f.root-servers.net.

.                       518011  IN      NS      g.root-servers.net.

.                       518011  IN      NS      h.root-servers.net.

.                       518011  IN      NS      i.root-servers.net.

.                       518011  IN      NS      j.root-servers.net.

.                       518011  IN      NS      k.root-servers.net.

.                       518011  IN      NS      l.root-servers.net.

.                       518011  IN      NS      m.root-servers.net.

.                       518011  IN      NS      a.root-servers.net.

.                       518011  IN      NS      b.root-servers.net.

.                       518011  IN      NS      c.root-servers.net.

.                       518011  IN      NS      d.root-servers.net.

.                       518011  IN      NS      e.root-servers.net.

;; Received 512 bytes from 127.0.0.1#53(127.0.0.1) in 1 ms

 

com.                    172800  IN      NS      k.gtld-servers.net.

com.                    172800  IN      NS      c.gtld-servers.net.

com.                    172800  IN      NS      d.gtld-servers.net.

com.                    172800  IN      NS      g.gtld-servers.net.

com.                    172800  IN      NS      f.gtld-servers.net.

com.                    172800  IN      NS      e.gtld-servers.net.

com.                    172800  IN      NS      j.gtld-servers.net.

com.                    172800  IN      NS      b.gtld-servers.net.

com.                    172800  IN      NS      h.gtld-servers.net.

com.                    172800  IN      NS      m.gtld-servers.net.

com.                    172800  IN      NS      a.gtld-servers.net.

com.                    172800  IN      NS      l.gtld-servers.net.

com.                    172800  IN      NS      i.gtld-servers.net.

;; Received 493 bytes from 192.5.5.241#53(f.root-servers.net) in 64 ms

 

dig: couldn't get address for 'k.gtld-servers.net': failure

 

 

2-      named_dump.db

 

; ns1lo6.example.com [v4 TTL 167] [v6 TTL 167] [v4 failure] [v6 failure]

; ns2nj.example.com [v4 TTL 167] [v6 TTL 167] [v4 failure] [v6 failure]

; ns2dc2.example.com [v4 TTL 167] [v6 TTL 2] [v4 not_found] [v6 nxrrset]

; ns2lo6.example.com [v4 TTL 167] [v6 TTL 167] [v4 failure] [v6 failure]

; ns1nj.example.com [v4 TTL 167] [v6 TTL 167] [v4 failure] [v6 failure]

 

 

3-      ServerFAIL 

 

; <<>> DiG 9.8.0 <<>> www.example.com

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 58716

;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

 

 

Regards

Daniel 

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