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Reply to: nslookup and dns failure
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Previously on "nslookup and dns failure"
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Originally posted by NotAllThere View Post
It sometimes works, sometimes doesn't.
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Originally posted by PerfectStorm View PostSome domains have ping blocked dont they - could be that
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Sorry. Bunch of typos in the original post. Fixed now.
I tried my workaround again and it seems it was coincidence. Putting the ip address directly works.
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Originally posted by NotAllThere View PostCan anyone explain this? Windows 11.
I ping something like myserver.nat.com and get: Ping request could not find host myserver.nat.com. Please check the name and try again.
I then nslookup myserver.nat.com and get something like
Server: mydnsserver.nat.com
Address: 10.1.1.1
Name: myserver.nat.com
Address: 10.1.1.2
And now the ping works.
Like this lookup to an autodiscover CNAME
C:> nslookup autodiscover.domain.com
Server: custcache01.dns.zen.net.uk
Address: 212.23.3.100
Non-authoritative answer:
Name: autod.ms-acdc-autod.office.com
Addresses: 2603:1026:c06:141e::8
2603:1026:c06:23::8
2603:1026:c06:1f::8
2603:1026:c06:180d::8
52.97.211.168
52.97.129.72
52.97.129.248
52.97.179.248
Aliases: autodiscover.domain.com
autodiscover.outlook.com
autod.ha-autod.office.com
c:\> ping autodiscover.domain.com
Pinging autod.ms-acdc-autod.office.com [52.97.211.72] with 32 bytes of data:
Reply from 52.97.211.72: bytes=32 time=14ms TTL=243
Reply from 52.97.211.72: bytes=32 time=15ms TTL=243
Reply from 52.97.211.72: bytes=32 time=14ms TTL=243
Reply from 52.97.211.72: bytes=32 time=20ms TTL=243
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Windows is probably caching the result of the DNS nslookup so that ping doesn’t then attempt it until it’s deleted from the cache. The ping command ordinarily needs to do the DNS lookup of your hostname and then send/receive packets. If the lookup part fails via ping, I think that would explain it. As to why it fails intermittently, I have no idea. Does it ever fail if you ping the FQDN, for example?
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Weird.
After you've done nsloopup myserver.nat.com, how long does ping myserver.nat.com keep working? Just for that CMD session, or until you reboot?
When you get the failure, the following might reveal something:
ping -a 10.1.1.2
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nslookup and dns failure
Can anyone explain this? Windows 11.
I ping something like myserver.nat.com and get: Ping request could not find host myserver.nat.com. Please check the name and try again.
I then nslookup myserver.nat.com and get something like
Server: mydnsserver.nat.com
Address: 10.1.1.1
Name: myserver.nat.com
Address: 10.1.1.2
And now the ping works.Tags: None
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