I've a setup where servers in different groups use send-hostname to inform the DNS about them being there.
Now, this works ok because I'm setting the domain name as "server1.group1.domain.com" which is not what I want, I'd prefer the hostnames to be "server1" and the DNS would assign hostname+

This happens on a virtual environment where I do create, start,stop machines often.

I'm using dnsmasq as server and Debian as clients but I could change that.

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By obfuscating your domain and host names, you've confused your question to the point that it is incomprehensible. Please clarify your question so that people can tell what you are actually asking. – JdeBP Jun 11 '11 at 12:43
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