[Samba] Forward lookup DNS Issues samba 4.1.12-9 el6

[Harry Jede]

On 11:55:13 wrote Neil:
> Hi guys,
> 
> I know this sounds vague and I'll try to explain in more depth now,
> but firstly, does Samba4 internal DNS, cache any records that were
> looked up from a forwarder, and then secondly what is the default
> timeout for waiting for a DNS lookup off of a DNS forwarder?
> 
> I've installed two new Samba4 PDC's(using the built in DNS server and
> not named) for two separate sites, and both had an existing DNS
> server using named configured with multiple forwarders and both
> sites retained the existing named DNS servers and forwarders. Since
> the Samba4 PDC's went in users now have their DNS's set to the
> Samba4 machines and nothing else. Then the Samba4 is configured to
> just lookup any Internet names it doesn't know about via the single
> forwarder off of the older caching named servers.
> 
> Sporadically I seem to get an instant DNS resolution failure(almost
> like my named caching DNS server wasn't even checked), but if you
> refresh or run the same ping again, the name then resolves straight
> away. I can understand if a DNS name doesn't resolve straight away
> due to line speed issues or packet loss, but usually I'd expect this
> would take a few seconds to timeout and not fail instantly.
> 
> If I use my old named caching DNS server I don't get the same
> behaviour, does anyone know why we would experience this?
No,
but I have had a similiary situation some weeks ago. I solved the 
problem this way:

switch from internal DNS to bind8 or bind9 with DLZ, see samba wiki
declare this bind instance as "forward only"
make your current internal forwarders a slave for your samba DNS

> 
> Thank you.
> 
> Regards.
> 
> Neil Wilson.


-- 

Regards

	Harry Jede