Github user wido commented on the issue:
https://github.com/apache/cloudstack/pull/1700
@NuxRo There are two things to it.
First, yes, it saves a lot, a lot of code by using SLAAC/EUI-64. No need to
configure dnsmasq or anything else. No failure possible where the VR is not
responding or properly configuring the lease in it's database.
Secondly, with IPv6 Router Advertisements are mandatory anyway. DHCPv6
can't tell a Instance which gateway to use, that is always done by a RA.
With IPv6 using RA/SLAAC is most widely used and supported on all operating
systems.
So using SLAAC makes life much, much easier. DHCPv6 is just not required at
all.
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