[
https://issues.apache.org/jira/browse/CLOUDSTACK-9359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15591386#comment-15591386
]
ASF GitHub Bot commented on CLOUDSTACK-9359:
--------------------------------------------
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.
> Return ip6address in Basic Networking
> -------------------------------------
>
> Key: CLOUDSTACK-9359
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-9359
> Project: CloudStack
> Issue Type: Sub-task
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Components: API, Management Server
> Environment: CloudStack Basic Networking
> Reporter: Wido den Hollander
> Assignee: Wido den Hollander
> Labels: api, basic-networking, ipv6
> Fix For: Future
>
>
> In Basic Networking Instances will obtain their IPv6 address using SLAAC
> (Stateless Autoconfiguration) as described in the Wiki:
> https://cwiki.apache.org/confluence/display/CLOUDSTACK/IPv6+in+Basic+Networking
> When a ip6cidr is configured and is a /64 we can calculate the IPv6 address
> an Instance will obtain.
> There is no need to store a IPv6 address in the database with the /64 subnet
> (ip6cidr) and the MAC address we can calculate the address using EUI-64:
> "A 64-bit interface identifier is most commonly derived from its 48-bit MAC
> address. A MAC address 00:0C:29:0C:47:D5 is turned into a 64-bit EUI-64 by
> inserting FF:FE in the middle: 00:0C:29:FF:FE:0C:47:D5. When this EUI-64 is
> used to form an IPv6 address it is modified:[1] the meaning of the
> Universal/Local bit (the 7th most significant bit of the EUI-64, starting
> from 1) is inverted, so that a 1 now means Universal. To create an IPv6
> address with the network prefix 2001:db8:1:2::/64 it yields the address
> 2001:db8:1:2:020c:29ff:fe0c:47d5 (with the underlined U/L (=Universal/Local)
> bit inverted to a 1, because the MAC address is universally unique)."
> The API should return this address in the ip6address field for a NIC in Basic
> Networking.
> End-Users can use this, but it can also be used internally by Security
> Grouping to program rules.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
