DNS Resolver "forgets" Domain Overrides from time to time

[Gertjan]

Hi,

When it happens again, before restarting the Resolver, check the file /etc/hosts
Your DNS override should be there.
And the Resolver primes from that file.

[diego27]

This post is deleted!

[diego27]

@Gertjan

It doesn't happened since I posted my question, but I took a look at the hosts file and I can't see any overwrite in there. See:

Content of hosts file (anonymized):

127.0.0.1       localhost localhost.example.com
::1     localhost localhost.example.com
192.168.1.1    myfw.example.com myfw

[johnpoz]

When you you say you can not resolve your AD domain, the override is not listed in domain overrides?

domain overrides would not be in the /etc/hosts file, only host overrides would be there.

Domain overrides would be here

[2.4.5-RELEASE][admin@sg4860.local.lan]/var/unbound: cat domainoverrides.conf 
forward-zone:
        name: "something.com"
        forward-addr: 192.168.9.44
[2.4.5-RELEASE][admin@sg4860.local.lan]/var/unbound: 

[Gertjan]

Strange.

I just check the manual : host overrides MUST be there.

Like these :

I found it in the /etc/hosts file like

...
10.0.0.2	ddwrt.brit-hotel-fumel.net ddwrt
....

All DHCP Static leases, and dynamic leases should be there also.

edit : host overrides - domain ovverride is something different, they go into the unbound config (didn't check).

[johnpoz]

That is not a "domain override" that is just a host entry.. Ie a host override..

Yeah all those would be in etc/hosts

[diego27]

@johnpoz

If I go under Diagnostics->DNS Lookup normally it resolves fine:

But from time to time something happens and the domain couldn't be resolved anymore. Then in DNS Lookup:

Then if I restart the DNS Resolver Service it directly works again.

Currently it works and I can see it also in the domainoverrides.conf

[johnpoz]

your using .local - yeah that not a good idea at all! Apple screwed the pooch for doing that long time ago..

[diego27]

@johnpoz Okay thx for the info. I'll fix this and hope that this is somehow related to my problem.

[johnpoz]

When they came out with RFC 6762, and using .local for mdns stuff - not a good idea to use that for your local dns names. I would stay away from any single label as well to be honest.

Using something like lan.localdomain if you want.. something.tld is best.. In a perfect world you wold own actual domain, just not use it on the public side.. Or just use something that is unlikely ever going to be a public tld..

I use local.lan - since I find it very very unlikely that .lan will ever be a public .tld

[jimp]

RFC 8375 sets aside .home.arpa for this kind of use, which is what everyone should be migrating to eventually (unless you have a real domain)