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bind transfer-source

I've three nameserver load-balanced (LB) in three geo locations. Each LB has a front end public IP address and two backend IP address (one for BIND and another for zone transfer) are assigned to actual bind 9 server running Red Hat Enterprise Linux 5.2 as follows:

LB1 - 202.54.1.2 -> Master BIND 9.x
LB2 - 75.54.1.2  -> Slave BIND 9.x
LB3 - 41.54.1.2 -> Slave BIND 9.x

So when a zone transfer initiates from slave server, all I get following errors in master BIND 9 server (LB1):

Jan  1 14:11:20 ns1 named[5323]: client 75.54.xx.xx#50968: zone transfer 'example.com/AXFR/IN' denied
Jan  1 14:11:20 ns1 named[5323]: client 75.54.xx.xx#54359: zone transfer 'example.org/AXFR/IN' denied

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