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828
Posted By broy32000
Here it is: root@VDIkali:~/DNS_RCA# cat...
Here it is:
root@VDIkali:~/DNS_RCA# cat /etc/resolv.conf
search biman.net
nameserver 192.168.1.126
nameserver 192.168.5.2
828
Posted By broy32000
Exactly, I want that.
Exactly, I want that.
828
Posted By broy32000
biman.net is the domain name. "shortname" does...
biman.net is the domain name. "shortname" does not exist neither as a DNS record , nor as device's name. I am just explaining how DNS client is behaving when query is made for a non-existent record
828
Posted By broy32000
I think I have failed to articulate the problem....
I think I have failed to articulate the problem. Let me try again.
The client, in the first attempts, append the domainname (as it is in the resolv.conf). If the record is not found then it tries...
828
Posted By broy32000
Hi Neo, Are you suggesting that I should...
Hi Neo,
Are you suggesting that I should create short name alias for potentially every name that is absent in DNS ? Note that "ServFail" happens for absent records.
828
Posted By broy32000
Hi Robin, I think I missed something when I...
Hi Robin, I think I missed something when I posted the question. When query is made for short name, client does append the domainname (bimna.net) first time. When DNS server returns with NXDomain...
828
Posted By broy32000
I think it is adding (at least now) the domain...
I think it is adding (at least now) the domain name. But that is not improving the result.
See below the DNS server returns "ServFail" eventually.


command : nslookup shortname
TCPDUMP: ...
828
Posted By broy32000
cat /etc/resolv.conf options timeout 2 ...
cat /etc/resolv.conf
options timeout 2
options attempts 2
nameserver 192.168.1.126
nameserver 192.168.1.12

Note that I have kept 2nd server down

Query and response without FQDN:
nslookup...
828
Posted By broy32000
Linux is not appending domain name in DNS query
In my /etc/resolv.conf file there is domain name defined. But when I do nslookup the domain name is not appended. Why?
1,887
Posted By broy32000
Some more evidences: 19:20:00.768582 IP...
Some more evidences:

19:20:00.768582 IP 172.18.140.80.43432 > 172.28.3.40.53: 62969+ AAAA? DMPCUSG01. (27)
19:20:00.769278 IP 172.28.3.40.53 > 172.18.140.80.43432: 62969 ServFail 0/0/0 (27)...
1,887
Posted By broy32000
Just asking for another help, if you can. I was...
Just asking for another help, if you can. I was analysing my DNS traffic using tcpdump (not verbose mode) in a AIX client. I found that a lot of repeat of transaction IDs over matter of hours. Is it...
1,887
Posted By broy32000
Thanks. Just 2 comments: 1. In our company, we...
Thanks. Just 2 comments:
1. In our company, we had a big service outage because of secondary DNS server going down. At the first thought we were surprised why requests were even trying to go to the...
1,887
Posted By broy32000
Home Questions Tags Users Unanswered Windows 2016 DNS server returns SERVFAIL for non-existing doma
I have two DNS resolvers in /etc/resolv.conf file. The top one is Windows DNS server, and the bottom one is my wi-fi router. Please see below. nameserver 192.168.1.126 nameserver 192.168.1.1

In...
608
Posted By broy32000
Webscrab proxy creates loads of TCP6 connections despite IPV6 being down
I am working in Kali Linux. I have disabled ipv6 by the command, "sysctl -w net.ipv6.conf.all.disable_ipv6=1". Below output of "ifconfig -a" shows no IPV6.

eth0:...
574
Posted By broy32000
What determines DNS will query IPV6 address?
When I do simple nslookup it does not generate any query for IPV6 (AAAA). But sometimes I see DNS query for both A and AAAA are generated. What decides this? The reason I do not want AAAA query is in...
1,678
Posted By broy32000
DNS servers are Windows 12. I do not have much...
DNS servers are Windows 12. I do not have much control over those. Is there anyway to increase the verbosity of logging in AIX client?

The AIX clients are running AIX 6.x , as far as I remember....
1,678
Posted By broy32000
Thanks all for answering. I still do not...
Thanks all for answering. I still do not understand why impact is observed when the secondary is down and the primary is still up.
1,678
Posted By broy32000
Hi Neo, First level failure: The CPU DNS...
Hi Neo,
First level failure: The CPU DNS server (Windows DC) spiked. This DNS server appears as the 2nd server in /etc/resolv.conf file.
Second (result of the 1st): Application servers were...
1,678
Posted By broy32000
Hi Neo, One DNS server out of two failed...
Hi Neo,
One DNS server out of two failed only once. And that caused impact. We are able to reproduce the problem. We want to find out why the impact is felt even though the other DNS server was...
1,678
Posted By broy32000
One of the two DNS server going down causes impacts
Our computing enviornment consists for Linux, Solaris , AIX, Windows. /etc/resolv.conf file of each *nix has two entries. When the 2nd one goes down we are seeing impacts on AIX hosted services. We...
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