in-addr.arpa: NXDOMAIN

[Aidancov1]

How can I fix this in my network?

** server can't find 17.0.168.192.in-addr.arpa: NXDOMAIN

I can ping all clients but nslookup produces th above error.

Thanks

 

[eibgrad]

It just means there's no known domain name associated w/ that public IP address. Nothing requires ALL public IPs to be associated w/ a domain name. So getting NXDOMAIN as a result is NOT really an error. If it bothers you, you can simply ignore it as follows.

nslookup 17.0.168.192 2>/dev/null

 

[Aidancov1]

Ah okay thanks

 

[ColinTaylor]

@eibgrad's reply is not quite correct.

Your output is a reverse DNS lookup for IP address 192.168.0.17. But your DNS server doesn't have an entry for that.

That usually means that your DNS server is not setup correctly. But without knowing much more about your DNS environment I can't speculate further.

 

[Aidancov1]

@eibgrad's reply is not quite correct.

Your output is a reverse DNS lookup for IP address 192.168.0.17. But your DNS server doesn't have an entry for that.

That usually means that your DNS server is not setup correctly. But without knowing much more about your DNS environment I can't speculate further.

I just have asus router then a RPi running dns and adguardhome.

 

[bennor]

I just have asus router then a RPi running dns and adguardhome.

By RPi running dns does that mean you are running Pi-Hole on the Raspberry Pi? If not then what does "running dns" mean? Or do you mean to say your AdGuardHome performing the DNS?

If you are running Pi-Hole and AdGaurdHome at the same time, a question might be; why?

 

[ColinTaylor]

I just have asus router then a RPi running dns and adguardhome.

"just". So that's potentially 3 DNS servers then.

So what is the DNS name for the device with IP address 192.168.0.17?

And what command did you issue (and from which device) that generated the message in post #1?

 

[Aidancov1]

By RPi running dns does that mean you are running Pi-Hole on the Raspberry Pi? If not then what does "running dns" mean? Or do you mean to say your AdGuardHome performing the DNS?

If you are running Pi-Hole and AdGaurdHome at the same time, a question might be; why?

AdGuardHome is performing the DNS on a Raspberry Pi 4. Asus router is providing DHCP. I don't have Pi-hole installed.

 

[tgl]

Your DNS server seems to be set up to resolve names to local IP addresses but not vice versa. I don't know anything about AdGuardHome so I can't counsel on how to fix it to do both. In a standard DNS server like BIND, forward and reverse maps are totally independent and you have to put an entry into each one if you want both lookup directions to work. AdGuardHome might have scripting to make that easier, but if so it doesn't seem to be working for you.

Adding DHCP into the mix makes that even more fun, because then you don't have any solid fix on which IP address will be handed out to which machine. Some systems have built scripts that pull assignments out of the DHCP server and put them into the DNS server, but that's all ad-hoc hackery AFAIK, and there sure won't be any such cooperation between your RPI and your Asus router.

For me, the path of least resistance has always been to statically assign IP addresses to machines that I cared about having DNS entries for.