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    IPv6 support in XCP-ng for the management interface - feedback wanted

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    • BenjiReisB
      BenjiReis Vates 🪐 XCP-ng Team 🚀 @AtaxyaNetwork
      last edited by

      @AtaxyaNetwork so infact the issue was with our IPv6 lab config (lol) so XOA is reachable in fact with an IPv6 address ahah.
      So you can play with it.

      Now i'm back on my DHCPv6/Autoconf/SLAAC investigations 🙂

      BenjiReisB 1 Reply Last reply Reply Quote 0
      • BenjiReisB
        BenjiReis Vates 🪐 XCP-ng Team 🚀 @BenjiReis
        last edited by BenjiReis

        Hi all!

        8.2.1 IPv6 ISO available!

        Here's a new ISO for IPv6 based on XCP-ng 8.2.1!
        The ISO can be used to upgrade an existing server installed with the previous IPv6 test ISO or install a brand new XCP-ng 8.2.1 with IPv6 support on management interface.

        A non-IPv6 8.2.0 would remain non-IPv6 after an upgrade as it's not possible to edit the management interface's primary adress type.

        An 8.2.0 IPv6 hosts can also be upgraded via yum: yum upgrade --enablerepo=xcp-ng-updates,xcp-ng-ipv6.

        What's new

        • All 8.2.1 fixes
        • Better DNS management in the case of both IPv4 and IPv6 configured on a PIF
        • Partial support of IPv6 DHCP and autoconf

        What to test

        • Your daily uses of XCP-ng but with IPv6
        • DHCP and autoconf (I have reached the limits of my knowledge so help from the community with more IPv6 expertise would be very VERY VERY helpful! :D)
          The goal of this ISO release is mainly to get help and leads about what's missing in DHCP and Autoconf.

        Any issue encountered (and what works fine also) can be reported in this thread.

        Usual warning

        This a test ISO with an experimental feature still in development.
        IPv6 on management interface is not officially supported by XCP-ng yet and so, we do not recommend to use it for a production environment.

        Thanks a lot for the help and I hope the ISO will work well for everyone.

        AtaxyaNetworkA 1 Reply Last reply Reply Quote 2
        • AtaxyaNetworkA
          AtaxyaNetwork Ambassador 📣 @BenjiReis
          last edited by

          @BenjiReis Hello !
          Thank you for the ISO !

          I just tested the install in a VM (for the moment, soon I will have a physical machine available)

          First review:
          So far, the autoconf seem to be working !
          But, during the installation, I provide a IPv6 DNS (the Cloudflare one, 2606:4700:4700::1111), but DNS is not working, as I have 1.1.1.1 in my /etc/resolv.conf
          I don't know if is the autoconf who is pushing the 1.1.1.1 (i need to check my router first), but I think is better if when we give a DNS, it bypass the autoconf

          More test is coming the next few day 🙂

          (sorry if my English is a bit bad)

          Thank you and the team for all you work !

          BenjiReisB 1 Reply Last reply Reply Quote 2
          • BenjiReisB
            BenjiReis Vates 🪐 XCP-ng Team 🚀 @AtaxyaNetwork
            last edited by

            @AtaxyaNetwork thanks for the report.

            I reproduced the issue, for some reason at first boot XCP-ng launch an IPv4 dhclient request (even though IPv4 is not configured on the management interface...) which overrides the DNS set after the request is replied to.

            M 1 Reply Last reply Reply Quote 1
            • M
              mbunkus @BenjiReis
              last edited by mbunkus

              @BenjiReis I've just started giving the IPv6-enabled 8.2.1 a try. Right within the first hour I've stumbled across the following two issues on an IPv6-only server:

              Repository mirrors

              The preconfigured repositories use mirrors.xcp-ng.org. That one returns the address of an actual mirror. And if that mirror happens not to have an IPv6 address, doing anything (e.g. yum makecache) fails.

              Re-running it might return on with AAAA records; then it does work — or maybe it'll be another AAAA-less mirror.

              NFS mounting via host name

              NFS mounting doesn't work if I use a host name that has both A and AAAA records (the problem isn't the A record, though). I've tried to do this via XOA. After entering everything the list of exports available on the server is actually populated, but selecting one will result in the following error in /var/log/SMlog:

              Jun  9 19:38:55 ul SM: [7165] ['mount.nfs', 'sweet-chili.int.bunkus.org:/srv/nfs4/home/', '/var/run/sr-mount/probe', '-o', 'soft,proto=tcp,vers=3,acdirmin=0,acdirmax=0']
Jun  9 19:38:55 ul SM: [7165] FAILED in util.pread: (rc 32) stdout: '', stderr: 'mount.nfs: Network is unreachable
Jun  9 19:38:55 ul SM: [7165] '
Jun  9 19:38:55 ul SM: [7165] Raising exception [73, NFS mount error [opterr=mount failed with return code 32]]
Jun  9 19:38:55 ul SM: [7165] lock: released /var/lock/sm/sr
Jun  9 19:38:55 ul SM: [7165] ***** generic exception: sr_probe: EXCEPTION <class 'SR.SROSError'>, NFS mount error [opterr=mount failed with return code 32]
Jun  9 19:38:55 ul SM: [7165]   File "/opt/xensource/sm/SRCommand.py", line 110, in run
Jun  9 19:38:55 ul SM: [7165]     return self._run_locked(sr)
Jun  9 19:38:55 ul SM: [7165]   File "/opt/xensource/sm/SRCommand.py", line 159, in _run_locked
Jun  9 19:38:55 ul SM: [7165]     rv = self._run(sr, target)
Jun  9 19:38:55 ul SM: [7165]   File "/opt/xensource/sm/SRCommand.py", line 332, in _run
Jun  9 19:38:55 ul SM: [7165]     txt = sr.probe()
Jun  9 19:38:55 ul SM: [7165]   File "/opt/xensource/sm/NFSSR", line 170, in probe
Jun  9 19:38:55 ul SM: [7165]     self.mount(temppath, self.remotepath)
Jun  9 19:38:55 ul SM: [7165]   File "/opt/xensource/sm/NFSSR", line 133, in mount
Jun  9 19:38:55 ul SM: [7165]     raise xs_errors.XenError('NFSMount', opterr=exc.errstr)

              The problem here is mount.nfs -o proto=tcp. As can be seen in man 5 nfs the udp and tcp protocols only use IPv4 where as udp6 and tcp6 only use IPv6. I'm not aware of a way of saying "use TCP as the protocol, resolve the name, prefer IPv6 over IPv4", unfortunately.

              This isn't limited to XOA, obviously; the corresponding call xe sr-probe type=nfs device-config:server=sweet-chili.int.bunkus.org device-config:serverpath=/srv/nfs4/space fails the same way.

              One possible way of addressing this could be to resolve the host name right before constructing the mount commands & using the correct proto depending on whether the management interface is IPv6 enabled.

              Note that using an IPv6 address instead of a host name does not work either: even though sr-create works as proto=tcp6 is used in the mount calls according to /var/log/SMlog, the later sr-create does not work with similar error messages.

              I can file issues for both on Github, if that helps. The second one in xcp-ng/xcp, I guess, but where would I file the first one? vatesfr/xen-orchestra?

              BenjiReisB 1 Reply Last reply Reply Quote 0
              • BenjiReisB
                BenjiReis Vates 🪐 XCP-ng Team 🚀 @mbunkus
                last edited by BenjiReis

                @mbunkus thanks for the report.

                About entering an IPv6 address for NFS in XOA: did you put the [] around the IPv6?
                If so and it still failed you can indeed create an issue on vatesfr/xen-orchestra repo (make sure to reference this thread if you do).

                For the rest, no need to create issues, i'm aware of them and I'll note them in our internal board for next devs. 🙂

                Regards

                mathieu-gillootsM 1 Reply Last reply Reply Quote 0
                • mathieu-gillootsM
                  mathieu-gilloots @BenjiReis
                  last edited by

                  Thanks for your work ! 🙂
                  I'm little new in xcp-ng, I was on xen few year ago.

                  I'm trying xcp-ng with an ipv6 only server.
                  ISO file is Ok for install.
                  Just a little thing, mirrors of packages don't all have an ipv6 record, and on a ipv6 installation I have some error.

                  I just change the file /etc/yum.repos.d/xcp-ng.repo :
                  Before :

                  ...
baseurl=http://mirrors.xcp-ng.org/8/8.2/base/x86_64/ http://updates.xcp-ng.org/8/8.2/base/x86_64/
...

                  After :

                  ...
baseurl=https://updates.xcp-ng.org/8/8.2/base/x86_64/
...

                  Regards

                  1 Reply Last reply Reply Quote 0
                  • olivierlambertO
                    olivierlambert Vates 🪐 Co-Founder🦸 CEO 🧑‍💼
                    last edited by

                    Hey good catch! Let me check and fix that ASAP!

                    1 Reply Last reply Reply Quote 0
                    • olivierlambertO
                      olivierlambert Vates 🪐 Co-Founder🦸 CEO 🧑‍💼
                      last edited by olivierlambert

                      Are you sure about this? 🤔

                      olivier@test:~$ ping mirrors.xcp-ng.org
PING mirrors.xcp-ng.org(alpha.xcp-ng.org (2a01:240:ab08:2::2)) 56 data bytes
64 bytes from alpha.xcp-ng.org (2a01:240:ab08:2::2): icmp_seq=1 ttl=63 time=0.386 ms
64 bytes from alpha.xcp-ng.org (2a01:240:ab08:2::2): icmp_seq=2 ttl=63 time=0.264 ms
^C
--- mirrors.xcp-ng.org ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1002ms
rtt min/avg/max/mdev = 0.264/0.325/0.386/0.061 ms

olivier@test:~$ ping updates.xcp-ng.org
PING updates.xcp-ng.org(alpha.xcp-ng.org (2a01:240:ab08:2::2)) 56 data bytes
64 bytes from alpha.xcp-ng.org (2a01:240:ab08:2::2): icmp_seq=1 ttl=63 time=0.672 ms
64 bytes from alpha.xcp-ng.org (2a01:240:ab08:2::2): icmp_seq=2 ttl=63 time=0.295 ms
^C
--- updates.xcp-ng.org ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1010ms
rtt min/avg/max/mdev = 0.295/0.483/0.672/0.188 ms

                      edit: aaaaah I see! It's just that SOME mirrors aren't IPv6 ready (ours are). This is indeed less trivial to solve. We'll discuss that with @stormi

                      mathieu-gillootsM 1 Reply Last reply Reply Quote 1
                      • mathieu-gillootsM
                        mathieu-gilloots @olivierlambert
                        last edited by

                        @olivierlambert Hello
                        Yes, the problem is on http://mirrors.xcp-ng.org/8/8.2/base/x86_64/repodata/repomd.xml, there is 302 Found to non-IPv6 urls

                        You can try with :

                        curl -IvL http://mirrors.xcp-ng.org/8/8.2/base/x86_64/repodata/repomd.xml

                        You will see the differents mirrors associated (Link), and some of them redirect to ipv4.

                        < Link: <https://xcpng-mirror.as208069.net/8/8.2/base/x86_64/repodata/repomd.xml>; rel=duplicate; pri=1; geo=fr
Link: <https://xcpng-mirror.as208069.net/8/8.2/base/x86_64/repodata/repomd.xml>; rel=duplicate; pri=1; geo=fr
< Link: <https://mirror.as50046.net/xcp-ng/8/8.2/base/x86_64/repodata/repomd.xml>; rel=duplicate; pri=2; geo=fr
Link: <https://mirror.as50046.net/xcp-ng/8/8.2/base/x86_64/repodata/repomd.xml>; rel=duplicate; pri=2; geo=fr
< Link: <https://mirror-xcpng.torontot.fr/8/8.2/base/x86_64/repodata/repomd.xml>; rel=duplicate; pri=3; geo=fr
Link: <https://mirror-xcpng.torontot.fr/8/8.2/base/x86_64/repodata/repomd.xml>; rel=duplicate; pri=3; geo=fr
< Link: <https://updates.xcp-ng.org/8/8.2/base/x86_64/repodata/repomd.xml>; rel=duplicate; pri=4; geo=fr
Link: <https://updates.xcp-ng.org/8/8.2/base/x86_64/repodata/repomd.xml>; rel=duplicate; pri=4; geo=fr
< Location: https://rg2-xcpng-mirror.reptigo.fr/8/8.2/base/x86_64/repodata/repomd.xml
Location: https://rg2-xcpng-mirror.reptigo.fr/8/8.2/base/x86_64/repodata/repomd.xml
...
couldn't connect to host at rg2-xcpng-mirror.reptigo.fr:443:
 Failed to connect to 45.152.69.252
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