Ok, the second line has to be deleted. But still I have some doubts. 

digging about bind: 

The master DNS for each zone is defined in the 'masters' statement of the zone 
clause and allows slaves to refresh their zone record when the 'expiry' 
parameter of the SOA Record is reached. If a slave cannot reach the master DNS 
when the 'expiry' time has been reached it will stop responding to requests for 
the zone. It will NOT use time-expired data.

in my zone file on the slave server I see the expire time is 1800. This means 
the slave stop resolving after 30 minutes.
Could be this the problem? 

mysipdomain.it         IN SOA  ns1.mysipdomain.it. root.mysipdomain.it. (
                                2010042303 ; serial
                                1800       ; refresh (30 minutes)
                                1800       ; retry (30 minutes)
                                1800       ; expire (30 minutes)
                                1800       ; minimum (30 minutes)
                                )

Thank you,
Heros








Ing. Heros Deidda 

Pre-sales VoIP Engineer 




----- Messaggio originale -----
Da: "Dale R Worley (Dale)" <[email protected]>
A: "Heros Deidda" <[email protected]>, [email protected]
Inviato: Martedì, 27 aprile 2010 20:34:23 GMT +01:00 
Amsterdam/Berlino/Berna/Roma/Stoccolma/Vienna
Oggetto: RE: [sipx-users] HA DNS server failure on slave when master is down

________________________________________
From: [email protected] 
[[email protected]] On Behalf Of Heros Deidda 
[[email protected]]

on the slave my /etc/resolv.conf is

search mysipdomain.it
nameserver 127.0.0.1
nameserver 172.16.5.1
________________________________________

You should never need to put a second "nameserver" line in /etc/resolv.conf -- 
if the caching nameserver on the secondary is not functioning, the secondary 
itself is not functioning.

Of course, you need more than one authoritative DNS server for your SIP domain.

Dale
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