GitHub user wido added a comment to the discussion: Support for an IPv6 prefix 
per VM in shared networks

> @wido @phsm we are working on static/dynamic routing for isolated networks 
> and vpc. ACS allocates a /64 network for each network (isolated/vpc tier). It 
> is not applicable for @phsm who uses share networks for public cloud (VPS)
> 
> For shared networks, there is a change in 4.19.1.0 (#9289) which allows 
> operators to create a shared network with other cidr than /64 I think it is 
> feasible, @phsm you can research it
> 
>     * create a new guru extends DirectNetworkGuru
> 
>     * override `isSlaacV6Only` (return false)
> 
>     * override the method `allocate` or `allocateDirectIp`

I discussed with @alexandremattioli that this code for dynamic routing of a 
subnet to a VPC router can be expanded to a shared network in the future. It 
will require some work, but in the future it would be great if you can allocate 
and deallocate a subnet to a VM or even multiple VMs.

This would allow you to do Anycast within CloudStack or other fancy BGP things 
on your VMs.

The work being done now would lay the foundation for this, but I do agree, it's 
not in scope now.

GitHub link: 
https://github.com/apache/cloudstack/discussions/9421#discussioncomment-10151342

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