andrijapanicsb opened a new issue #3706: Remove dhcp/dns configuration from VR, 
when VM is being DETACHED from a network
URL: https://github.com/apache/cloudstack/issues/3706
 
 
   As part of the additional cleanup discussed in 
https://github.com/apache/cloudstack/pull/3627,
   we also need to remove all  DHCP/DNS config data (and the active lease) from 
VR when VM is being DETACHED from a network (any network)
   
   Reason: we need to do the same dhcp/dns config cleanup (that we otherwise do 
only when VM is being expunged) when we detach network from a VM - since after 
VM is detached, its reference(s) to its previous network(s) is lost and will 
never be later cleaned up (dhcp/dns config) when VM is destroyed/expunged later.
   
   Multiple consequences (with multihomed VMs) can be seen if this is not fixed.
   
   @weizhouapache @rhtyd 

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