[Samba] DNS sometimes give error/timeout or works fine

[Rowland penny]

On 12/05/2020 12:31, Miguel Angel Coa M. via samba wrote:
> Hi,
> i've three samba DC's with BIND9_DLZ backend . The DNS queryes is erratic,
> sometimes from pc lan the DNS resolution work fine and on another
> occasion give timeout or fail
>
> My DC's are:
>
> [............]
> [root at sambadc03 ~]# host -t A mydomain.com
> mydomain.com has address 10.13.250.128
> mydomain.com has address 10.13.250.110
> mydomain.com has address 10.13.250.111
> mydomain.com has address 10.13.250.112
> [............]
>
> Note: The .110 and .111 are the same DC (this server have 2 ip's)
>
> Example:
>
> Query fail from pc
>
> [............]
> mcoa at mcoa-new-air:~|⇒  nslookup mydomain.com 10.13.250.112
> ;; connection timed out; no servers could be reached
> [............]
>
>  From the same pc and the same query .... result is ok
>
> [............]
> mcoa at mcoa-new-air:~|⇒  nslookup mydomain.com 10.13.250.112
> Server: 10.13.250.112
> Address: 10.13.250.112#53
>
> Name: mydomain.com
> Address: 10.13.250.112
> Name: mydomain.com
> Address: 10.13.250.111
> Name: mydomain.com
> Address: 10.13.250.128
> Name: mydomain.com
> Address: 10.13.250.110
> [............]
>
> If i check inside DC i've similar behavior
>
> Fail
>
> [............]
> [root at sambadc02 ~]# dig @10.13.250.112 mydomain.com ns
> ;; connection timed out; no servers could be reached
> [............]
>
>
> Works fine
> [............]
> [root at sambadc02 ~]# dig @10.13.250.112 mydomain.com ns +short
> sambadc01.mydomain.com.
> sambadc02.mydomain.com.
> sambadc03.mydomain.com.
> [............]
>
> Inside the DC consulting to 127.0.0.1 the query and resulte is fine
>
>
> What could be happening?

Not sure ;-)

Can we have more info, named.conf files, OS etc

Rowland