secondary enables serving a zone retrieved from a primary server.
Syntax
secondary [zones...]
zones zones it should be authoritative for. If empty, the zones from the configuration block
are used. Not that with an remote address to get the zone the above is not that useful.
A working syntax would be:
secondary [zones...] {
transfer from address
[transfer to address]
}
transfer from tell from which address to fetch the zone. It can be specified multiple time,
if one does not work another will be tried.
transfer to can be enabled to allow this secondary zone to be transfered again.
Examples
secondary [zones...] {
transfer from 10.0.1.1
transfer from 10.1.2.1
}