secondary dns updates

[Simon Hobson]

netdel wrote:

>Updates in the secondary DNS should happen when we update Serial no of
>the forward/reverse file of a particualar zone at the master or it
>should have
>after we update serial in master and restart the server at secondary ?
>
>My problem is that updates dont happen in secondary unless I restart
>the secondary DNS server.  Please tell is it like that or it should
>happen when I simply change a serial in master.

It depends on how your system is set up.

IFF your secondary is listed as an authoritative nameserver in the 
zone file (ie it is one of the listed NS records), OR the master has 
an also-notify statement that lists it, then it should update fairly 
quickly as the master will notify the slave when the zone changes. 
The slave is then responsible for requesting the update.

Otherwise, the slave will request the serial number periodically 
according to the time values set in the SOA record. So if your update 
period is set to several days, your updates may well take several 
days to propagate.

Simon

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