Views and zone transfer

A typical trap in operation with views
IP addresses for XFR must be consistent with view config
allocate multiple addresses on primary/secondary servers
transfer-source / notify-source
configure the addresses to be used
example
A1 and B1 match external view
A2 and B2 match internal view
use A1/A2 for external AXFR
use B1/B2 for internal AXFR