Something is always changing on your network -- new workstations arrive, you finally retire or sell the relic, or you move a host to a different network. First we'll discuss how to make the changes manually. Actually, we recommend that you use a tool to create the zone data files -- we were kidding about that wimp stuff, okay?
The main modification - is to remove quartz resonator replace 2 capacitors, cut one trace and connect DAC's pin to ground. If You don't have such, just go to closest mobile phone repair and they will do it for you.
So, XTAL_SEL pin must be cutted from VCC and grounded, this needed to switch DAC to external reference mode.
Slave name servers will load this new data sometime within the time interval defined in the SOA record for refreshing their data.
Sometimes your users won't want to wait for the slaves to pick up the new zone data -- they'll want it available right away.
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