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https://issues.apache.org/jira/browse/CLOUDSTACK-4132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13738641#comment-13738641
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Bharat Kumar commented on CLOUDSTACK-4132:
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i can see the option 81 in both request and response along with the value 
3-255-255 vm1.cs1cloud.internal when the dhcp-client-update is disabled. 

I do not see this in the dhcp-client-update enabled case. I am not sure what 
this means but I am thinking it is because the dnsmasq dose not update the 
clients dns record on its behalf, when the flag is enabled.


                
> current dnsmasq config does not allow guest virtual machines(clients) to 
> update its hostnames with a  DNS server
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: CLOUDSTACK-4132
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-4132
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the 
> default.) 
>          Components: Virtual Router
>    Affects Versions: 4.2.0
>            Reporter: Ram Ganesh
>            Assignee: Bharat Kumar
>            Priority: Critical
>             Fix For: 4.2.0
>
>
> Current dnsmasq.conf does not have "dhcp-client-update" flag enabled thereby 
> preventing say Windows clients to update AD servers with its hostname. We 
> should enhance the config file to support this. More information about this 
> parameter can be found here - 
> http://www.thekelleys.org.uk/dnsmasq/docs/dnsmasq-man.html

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