Webmin: Domain Slave in webmin and Domain Master in WHM/CPanel

In WHM/Cpanel server:

• open file /etc/named.conf and edit

    //allow-transfer    { "none"; };
    allow-transfer { your_public_ip_for_slave_dns; }; 

• restart your bind/named

# /scripts/restartsrv_named 

In Debian Jessie server:

• Open webmin, Servers -> BIND DNS Server -> Create slave zone

Zone type : Forward (Names to Adddress)
Domain name / Network : yourdomain.com
Record file : Automatic
Master server : your_debian_ip_address
Server port : Default

• Test Zone Transfer

Testing transfer of slave zone from master_ip_address .... from master_ip_address : Completed OKTest transfer successfully fetched 28 records from at least one nameserver. Actual transfers by BIND should also succeed.

Now you can add/edit your Domain Slave Server in WHM/CPanel -> Edit DNS Zone. 

Reference:

• https://www.debian.org/doc/manuals/network-administrator/ch-bind.html
• http://serverfault.com/questions/403848/configure-secondary-dns-server-debian