66 lines
2.6 KiB
Markdown
66 lines
2.6 KiB
Markdown
---
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layout: post
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title: Getting IPv6 working with SmartOS and KVM
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date: 16.09.2012 01:13
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---
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Just about 2 weeks ago I started to play around with [SmartOS][].
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SmartOS is a fairly recent hypervisor for virtualization, open-sourced by
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[Joyent][], the great guys behind [node.js][nodejs] in August 2011. It's based on [Illumos][], which
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itself is a fork of [Solaris][].
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The [wiki][] is a great place to get started as well as the [man page for vmadm][manpage].
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Of course I found more articles and [saved them in my pinboard account][pinboard].
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But one thing I did not really get to work was IPv6. After a while I found the
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wiki page for [IPv6 in a zone][ipv6zone] which worked, atleast for SmartOS
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zones.
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But I had no luck with my KVM-based Ubuntu machine. I did it the same way,
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using basic tools (`ifconfig/ip`, `/etc/network/interfaces`), but I could not
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even ping the machine itself from within the page.
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So I asked in the IRC channel (#smartos on freenode, great and friendly guys ;))
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While IPv6-support is still not included in SmartOS tools itself [some patches for this exist][ip6patches].
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This is only for zones and not for KVM instances, but I was told to check `dmesg` and other logs (d'oh! Why didn't I do this before?)
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And this is what I found:
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eth0: IPv6 duplicate address detected!
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A quick search turned up a [forum post][forumpost] which linked to [this blog post][duplicatefix].
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The fix:
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sudo sysctl net.ipv6.conf.eth0.accept_dad=0
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Put `net.ipv6.conf.eth0.accept_dad=0` into `/etc/sysctl.conf` to make it persistent.
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This disables the Duplicate Address Detection.
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After a reboot everything works and the machine works over IPv6.
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When I talked to my boss about this he directly knew another related problem and the explanation:
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> If you're wondering why a Linux machine won't do v6 anymore when doing a
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> monitor session over a VLAN which also hosts the default network: The machine
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> sees some Neighbor-talking over the VLAN and switches to `dadfailed`
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> effectively breaking the v6.
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[smartos]: http://smartos.org/
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[nodejs]: http://nodejs.org/
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[illumos]: http://illumos.org
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[solaris]: http://en.wikipedia.org/wiki/Solaris
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[joyent]: http://joyent.com/
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[wiki]: http://wiki.smartos.org/
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[manpage]: https://github.com/joyent/smartos-live/blob/master/src/vm/man/vmadm.1m.md
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[pinboard]: https://pinboard.in/u:badboy/t:smartos/
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[ipv6zone]: http://wiki.smartos.org/display/DOC/Setting+up+IPv6+in+a+Zone
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[ip6patches]: https://github.com/joshie/smartos-live/tree/ip6
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[duplicatefix]: http://timesinker.blogspot.de/2009/11/karmic-ipv6-global-address-problems.html
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[forumpost]: http://ubuntuforums.org/showthread.php?t=1410306
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