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Old 10-15-2009, 06:51 AM   #1
Registered: Jun 2009
Location: UK
Distribution: CentOS / RedHat
Posts: 83

Rep: Reputation: 16
Advice required merging two domains

Hi all,

I have an issue as follows, (I'll try and make it short!):

Years ago my company bought 4 linux servers to run their business systems, dbases, email server, intranet, DHCP, DNS etc. The installation company set this up as a '' domain (10.11.x.x).

More recently we have invested in 10 new servers (Microsoft for Active Directory, terminal services, some RedHat/CentOS for dbase and email), hosted at a data centre, to run a new business system. This different installation company decided to put it all on a 'my-domain.local' domain (10.11.254.x), with it's own DNS server.

I am experiencing lots of problems as we are moving Windows clients over to the 'my-domain.local' Windows domain (from '').

Basically, I believe the fact that we host services on both domains, yet require clients to access all services, is at the core of my problem.

For instance, we have an intranet service at '', but PCs on the 'my-domain.local' domain continuously have problems accessing the intranet service as they resolve * to our actual commercial web site hosted by an ISP. Obviously, as our actual intranet is internally hosted, this causes clients on the .local domain to just see 'page not found' errors (or equivalent).

The .local DNS server has a '' forwarder rule to my internal '' DNS server. I have tried adding an 'A' record of 'intranet' to the 'my-domain.local' DNS server's zone file, but this makes the FQDN to be, which is incorrect.

I pulled my hair out contending with this, so now I have decided that maybe the best course of action is simply to bite the bullet and move the old servers to the .local domain. Only problem is, I'm not sure how to do this and what the implications might be?

My immediate approach would be to manually change the hostnames of the 4 original linux servers to .local equivalents, alter the dhcpd.conf's 'option domain-name' from '' to 'my-domain.local' and point all DNS services to the new data centre's. Not sure what else I would need to consider though, or whether I am going around this the wrong way.

I really appreciate any help or advice you guys could offer in my hour of need!

Thanks in advance.


Last edited by elliot01; 10-15-2009 at 07:00 AM.
Old 10-16-2009, 05:49 PM   #2
Registered: Aug 2003
Location: france
Distribution: suse/fedora
Posts: 105

Rep: Reputation: 15
that is a really tricky question you have there. you will need professional help. it is a bad idea to mix local and internet wide dns. if you run servers on a commercial basis buy in one company that knows what it is doing to supervise the whole network (let them tear their hair out), it will be cheaper in the end.
linuxquestions is here to help you do stuff with linux, but I think you have a more general networking problem there.


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