weizhouapache commented on pull request #5786:
URL: https://github.com/apache/cloudstack/pull/5786#issuecomment-1067057928


   > @weizhouapache is it good idea to:
   > 
   > * allow updating internet protocol for an exisiting VPC offering (probably 
simplest)
   > * allow updating offering for an existing VPC
   > * or a different approach altogether
   
   @shwstppr 
   it will introduce a new feature: update vpc to another offering,might it be 
complicated ?
   
   it looks easier to
   (1) succeed to create a vpc tier, if there is an ipv6 address range 
available in same vlan as ipv4
   (2) fail to create a vpc tier, if there is not an ipv6 address range 
available in same vlan as ipv4
   
   as far as I remember, in the prototype, it worked if create a vpc tier with 
ipv6 in VPC without public ipv6 address ( an ipv6 address will be allocated and 
associated to eth0 in VPC VR when create the vpc tier). 
   public ipv6 address do not need to be pre-allocated in VPC.


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