Incorrect report

[tmcdonald]

What exact check_dns command are you using? What is the output?

[lmiltchev]

The order matters, that's why if your IPs are not in the correct order, the check will return "CRITICAL".

Example:

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[root@testbox libexec]# nslookup amazon.com
Server:         192.168.5.2
Address:        192.168.5.2#53

Non-authoritative answer:
Name:   amazon.com
Address: 72.21.194.212
Name:   amazon.com
Address: 72.21.215.232
Name:   amazon.com
Address: 176.32.98.166
Name:   amazon.com
Address: 205.251.242.54

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[root@testbox libexec]# ./check_dns -H amazon.com
DNS OK: 0.006 seconds response time. amazon.com returns 176.32.98.166,205.251.242.54,72.21.194.212,72.21.215.232|time=0.006434s;;;0.000000

If I use the same order, the check returns "OK":

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[root@testbox libexec]# ./check_dns -H amazon.com -a 176.32.98.166,205.251.242.54,72.21.194.212,72.21.215.232
DNS OK: 0.006 seconds response time. amazon.com returns 176.32.98.166,205.251.242.54,72.21.194.212,72.21.215.232|time=0.005897s;;;0.000000

But if I swap the IPs, I get "CRITICAL":

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[root@testbox libexec]# ./check_dns -H amazon.com -a 72.21.215.232,176.32.98.166,205.251.242.54,72.21.194.212
DNS CRITICAL - expected '72.21.215.232,176.32.98.166,205.251.242.54,72.21.194.212' but got '176.32.98.166,205.251.242.54,72.21.194.212,72.21.215.232'

[chitrangada]

Okay..! Now i understand how it works and will use it accordingly. Now if you want you can close the topic.
Thanks for sharing useful information.