This is still not working on my local test system:
192.168.1.8 - master with ns1.nowosci.org
192.168.1.9 - slave with ns2.nowosci.org
dig @192.168.1.9 private._domainkey.nowosci.org TXT
; <<>> DiG 9.9.3-rpz2+rl.13208.13-P2-RedHat-9.9.3-4.P2.el6 <<>> @192.168.1.9 private._domainkey.nowosci.org TXT
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 30976
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 2800
;; QUESTION SECTION:
;private._domainkey.nowosci.org. IN TXT
;; AUTHORITY SECTION:
nowosci.org. 1800 IN SOA ns1.nowosci.org. admin.adminonline.gr. 2013092404 3600 1800 604800 1800
;; Query time: 2 msec
;; SERVER: 192.168.1.9#53(192.168.1.9)
;; WHEN: wto wrz 24 15:09:48 CEST 2013
;; MSG SIZE rcvd: 119