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= DHCPv6 switch to DUID-UUID<!-- The name of your change proposal --> =
== Summary ==
<!-- A sentence or two summarizing what this change is and what it will do. This information is used for the overall changeset summary page for each release. -->
DHCP client and server should use [ RFC 6355] DUID UUID for DHCPv6 operations
== Owner ==
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* Name: [[User:Landgraf| Pavel Zhukov]]
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== Current status ==
* Targeted release: [[Releases/<number> | Fedora <number> ]]
* Last updated: <!-- this is an automatic macro — you don't need to change this line -->  {{REVISIONYEAR}}-{{REVISIONMONTH}}-{{REVISIONDAY2}}
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* Tracker bug: <will be assigned by the Wrangler>
== Detailed Description ==
<!-- Expand on the summary, if appropriate.  A couple sentences suffices to explain the goal, but the more details you can provide the better. -->
Currently DUID LL(T) is used for IPv6 address assignment and prefix delegation. This lead to  issues with devices which don't have hardware address assigned (like PPP) or devices which are not constantly assigned to the "server" (like wireless/usb devices
etc).  There are two main issues caused by this:
# Posible violation of [ RFC 3315]
# DUID cannot be assembled due to lack of hardware address which leads dhclient to exit with error and manual intervention is required. [ Bug#626514]
# DUID is changed between dhclient restarts as the result ISP doesn't delegate prefix which cause delays and connection outages [ Bug#1163379]
== Benefit to Fedora ==
Changing default to DUID UUID should solve mentioned issue and bring consistency within the distribution (NetworkManager uses DUID UUID from the beginning).
As this change depends on systemd feature (machineid) it may be hard to get patches merged upstream
<!-- What is the benefit to the platform?  If this is a major capability update, what has changed?  If this is a new functionality, what capabilities does it bring? Why will Fedora become a better distribution or project because of this proposal?-->
== Scope ==
* Proposal owners:
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* Other developers: N/A (not a System Wide Change) <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
<!-- What work do other developers have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->
* Release engineering: [ #Releng issue number] (a check of an impact with Release Engineering is needed) <!-- REQUIRED FOR SYSTEM WIDE AS WELL AS FOR SELF CONTAINED CHANGES -->
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** [[Fedora_Program_Management/ReleaseBlocking/Fedora{{FedoraVersionNumber|next}}|List of deliverables]]: N/A (not a System Wide Change) <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
<!-- Please check the list of Fedora release deliverables and list all the differences the feature brings -->
* Policies and guidelines: N/A (not a System Wide Change) <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
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== Upgrade/compatibility impact ==
<!-- What happens to systems that have had a previous versions of Fedora installed and are updated to the version containing this change? Will anything require manual configuration or data migration? Will any existing functionality be no longer supported? -->
This impact all installation which use dhclient to obtain ipv6 address or prefix. During the upgrade default duid changes from duid-ll to duid-uuid. Manual intervention is needed to protect old duid (or to update) is not decided yet.
== How To Test ==
<!-- This does not need to be a full-fledged document. Describe the dimensions of tests that this change implementation is expected to pass when it is done.  If it needs to be tested with different hardware or software configurations, indicate them.  The more specific you can be, the better the community testing can be.
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3. What are the expected results of those actions?
# DHCPv4 should continue operating as before '''TBD''': check if client-identifier is affected by this change!
# Prefix Delegation over PPP '''MUST''' work without manual intervention
# DUID '''MUST NOT''' be changed between connections (client runs)
# DUID '''MUST NOT''' be changed as the result of physical device removal/system restart/system upgrade/
== User Experience ==
<!-- If this change proposal is noticeable by its target audience, how will their experiences change as a result?  Describe what they will see or notice. -->
Users which use IPv4 only should not be affected by the change.
Users of IPv6 installations may need to notify their ISP about DUID changes or manually specify old DUID in leases file
== Dependencies ==
<!-- What other packages (RPMs) depend on this package?  Are there changes outside the developers' control on which completion of this change depends?  In other words, completion of another change owned by someone else and might cause you to not be able to finish on time or that you would need to coordinate?  Other upstream projects like the kernel (if this is not a kernel change)? -->
== Contingency Plan ==
<!-- If you cannot complete your feature by the final development freeze, what is the backup plan?  This might be as simple as "Revert the shipped configuration".  Or it might not (e.g. rebuilding a number of dependent packages).  If you feature is not completed in time we want to assure others that other parts of Fedora will not be in jeopardy.  -->
* Contingency mechanism:  Revert back to current DUID.  <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
<!-- When is the last time the contingency mechanism can be put in place?  This will typically be the beta freeze. -->
* Contingency deadline: N/A (not a System Wide Change)  <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
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== Documentation ==
<!-- Is there upstream documentation on this change, or notes you have written yourself?  Link to that material here so other interested developers can get involved. -->
This is Fedora (systemd enabled systems) specific change so the documentation should be written and submitted upstream
== Release Notes ==
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<!-- The release notes also help users know how to deal with platform changes such as ABIs/APIs, configuration or data file formats, or upgrade concerns.  If there are any such changes involved in this change, indicate them here.  A link to upstream documentation will often satisfy this need.  This information forms the basis of the release notes edited by the documentation team and shipped with the release.
Release Notes are not required for initial draft of the Change Proposal but has to be completed by the Change Freeze.
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<nowiki>Insert non-formatted text here</nowiki>

Latest revision as of 12:31, 16 March 2018