[libvirt-users] Assigning IPv6 address to guest

Bhasker C V bhasker at unixindia.com
Sat Oct 4 23:56:56 UTC 2014

On 04/10/14 21:13, The Cop wrote:
> On 10/4/2014 8:46 PM, Bhasker C V wrote:
>> On 04/10/14 15:36, The Cop wrote:
>>> Hello,
>>> I am trying to assign an IPv6 address to one of my guests. I followed the
>>> following guide, unsuccessfully:
> https://www.berrange.com/posts/2011/06/16/providing-ipv6-connectivity-to-virtual-guests-with-libvirt-and-kvm/
>>> .
>>> I have the following config files:
>>> dumpxml of the guest `deb`: http://sprunge.us/iUef
>>> net-dumpxml of network `default`: http://sprunge.us/WTfH
>>> net-dumpxml of network `ip6`: http://sprunge.us/YEXc
>>> Host:
>>> ifconfig: http://sprunge.us/cJOg
>>> Routing table: IPv6: http://sprunge.us/GChZ IPv4: http://sprunge.us/dACN
>>> /etc/network/interfaces: http://sprunge.us/fHcf
>>> /var/lib/libvirt/radvd/ip6-radvd.conf: http://sprunge.us/JcfF
>>> ip6tables: http://sprunge.us/JGBG
>>> uname -a: http://sprunge.us/acFF
>>> Guest:
>>> ifconfig: http://sprunge.us/JIFN
>>> Routing table: IPv6: http://sprunge.us/ZPfT IPv4: http://sprunge.us/gbXA
>>> /etc/network/interfaces: http://sprunge.us/ZaBB
>>> uname -a: http://sprunge.us/CFFL
>>> Both machines are running Debian Wheezy. virsh version is
> The IP
>>> address I'm trying to assign to the guest is "2607:5300:60:1156::2/64".
>>> Forgive me if I'm making some trivial mistake, but this is more or
> less the
>>> first time I'm productively using IPv6.
>>> Thanks
>>> _______________________________________________
>>> libvirt-users mailing list
>>> libvirt-users at redhat.com
>>> https://www.redhat.com/mailman/listinfo/libvirt-users
>> I assume you are using two different IPV6 address for the two machines.
>> I gave a quick scan of your mail but could not find what exactly is
> the issue you are facing ?
>> Are you not able to ping ? Is the IP not getting assigned ?
>> Are you able to ping link-local addresses  ?
>> what does  this command output look like ?
>> ip -6 nei
> I am using two different IPv6 addresses for the two different machines.
> I am unable to ping outside from the VM or connect otherwise via IPv6
> from the VM. I am also unable to ping the link-local addresses of the
> eth1 interface on the VM (via `ping6 fe80::5054:aaff:fe00:f057/64`).
> ip -6 nei on the VM gives me:
> `fe80::5054:ff:fe1d:a4bb dev eth1 lladdr 52:54:00:1d:a4:bb router STALE`

 Your setup shows
virbr2 and br0 both on the same network  2607:5300:60:1156::2/64 which
will cause issues with routing. This however must not affect the pinging
of link-local addresses

ON the virtual machine:
	ping -I <eth0> <link-local of server>
 must work.
If not
  check both side link-local addresses if they are set.

A quick way to check with "any-body on the segment please reply" is to
on virtual machine
ping6 -I <eth0>  ff02::1
You must see 2 addresses (one is your own link-local and the other is
the address on the server)

Example in my case is pasted (there are 4 machines):

$ ping6 -I n1 ff02::1
PING ff02::1(ff02::1) from fe80::2c3b:53ff:fea0:9d26 n1: 56 data bytes
64 bytes from fe80::2c3b:53ff:fea0:9d26: icmp_seq=1 ttl=64 time=0.099 ms
64 bytes from fe80::c4a2:78ff:fe7d:af8d: icmp_seq=1 ttl=64 time=0.590 ms
64 bytes from fe80::5054:ff:fe12:3456: icmp_seq=1 ttl=64 time=0.967 ms
64 bytes from fe80::5054:ff:fe12:3457: icmp_seq=1 ttl=64 time=2.10 ms (DUP!)
64 bytes from fe80::2c3b:53ff:fea0:9d26: icmp_seq=2 ttl=64 time=0.097 ms
64 bytes from fe80::c4a2:78ff:fe7d:af8d: icmp_seq=2 ttl=64 time=0.318 ms
64 bytes from fe80::5054:ff:fe12:3456: icmp_seq=2 ttl=64 time=0.701 ms
64 bytes from fe80::5054:ff:fe12:3457: icmp_seq=2 ttl=64 time=1.06 ms (DUP!)
--- ff02::1 ping statistics ---
2 packets transmitted, 2 received, +6 duplicates, 0% packet loss, time

If link-local address cannot be ping-ed then try pinging ::1.

More information about the libvirt-users mailing list