Linux clients are not registered in DNS using MS 2008 R2 DHCP and DNS servers

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i have mixed network of windows , linux clients , using windows 2008 r2 server both dhcp , dns service on network. dns servers on dcs , dhcp server operating on different server (a cluster actually.) on dhcp server i've set dns tab dynamically update dns , ptr records  (dns dynamic updates enabled,) discard , ptr records when lease deleted, , dynamically update dns , ptr records dhcp clients not request updates (just turned latter option on today.) not using name protection.

the problem linux clients not getting hostnames registered. mac's working fine windows clients, no dynamic linux clients in dns. i've tried setting dns accept both secure , insecure updates, really, shouldn't matter here since updater ms dhcp server, trusted source, correct?

i've tried various things on linux clients (all rhel variants,) ensuring dhcp_hostname set in ifcfg file, making sure hostname set properly, etc., none have solved problem.

aside actual solution, can suggest way debug this, monitoring dhcp dialog between client , ms dhcp server or dhcp dns server requests?

linux, other operating systems, follow industry standard dynamic dns updates.

windows dhcp works other dhcp servers, depends on how have dhcp configured.

this might understand what's involved dynamic updates:

ad & dynamic dns updates registration rules of engagement
http://blogs.msmvps.com/acefekay/2012/11/19/ad-dynamic-dns-updates-registration-rules-of-engagement/

.

as dhcp registration, follow settings in blog force dhcp update everything, no matter if os can update or not. set scavenging, too, many advantages method, blog shows.

dhcp service configuration, dynamic dns updates, scavenging, static entries, timestamps, dnsupdateproxy group, dhcp credentials, prevent duplicate dns records, dhcp has "pen" icon, , more...
published ace fekay, mct, mvp ds on aug 20, 2009 @ 10:36 am  3758  2 
http://msmvps.com/blogs/acefekay/archive/2009/08/20/dhcp-dynamic-dns-updates-scavenging-static-entries-amp-timestamps-and-the-dnsproxyupdate-group.aspx  

ace fekay
mvp, mct, mcitp/ea, mcts windows 2008/r2 & exchange 2007, exchange 2010 ea, mcse & mcsa 2003/2000, mcsa messaging 2003
microsoft certified trainer
microsoft mvp - directory services
technical blogs & videos: http://www.delawarecountycomputerconsulting.com/

this post provided as-is no warranties or guarantees , confers no rights.

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