Bug 813375

The RFC compliant syntax would be the second example you give

>  remote-viewer spice://[ipv6_addr]/?port=PORT

I have confirmed that this is indeed broken for both SPICE and VNC. The VNC support can be fixed in virt-viewer itself. The SPICE fix needs to be done in SPICE-GTK

Upstream virt-viewer patch for VNC side of things:

https://www.redhat.com/archives/virt-tools-list/2012-April/msg00094.html

Fixes for libvirt URIs and VNC URIs in virt-viewer-0.5.2-6.el6

Fix for SPICE URIs is to be handled by bug 813865 against spice-gtk

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Cause:
The URI parsing code did not expect URIs containing '[', ']' around the host component

Consquence:
It was not possible to connect to remote libvirt servers whose URI address contained raw IPv6 addresses (eg qemu+ssh://root@[2001::xxxx:1]/system ).

Fix:
The URI parsing was fixed to take account of the IPv6 address syntax

Result:
It is now possible to connect to remote libvirtd servers using raw IPv6 addresses

test pkgs:
virt-viewer-0.5.2-6.el6.x86_64
libvirt-0.9.10-13.el6.x86_64

step:
1:configure ipv6 global addr
#ifconfig eth0 inet6 add 3ffe::102/64
2:make sure ipv6 worked for libvirt
#virsh -c qemu+ssh://[3ffe::102]/system
root@3ffe::102's password: 
Welcome to virsh, the virtualization interactive terminal.

Type:  'help' for help with commands
       'quit' to quit

virsh # 
3:prepare a guest with vnc
.......
<graphics type='vnc' port='5901' autoport='yes' listen='0.0.0.0'>
      <listen type='address' address='0.0.0.0'/>
    </graphics>
.......
4:use remote-viewer to connect the guest
#remote-viewer vnc://[3ffe::102]:5901 --debug
** (remote-viewer:26689): DEBUG: fullscreen display 0: 0
** (remote-viewer:26689): DEBUG: fullscreen display 0: 0
** (remote-viewer:26689): DEBUG: Opening display to vnc://[3ffe::102]:5901
** (remote-viewer:26689): DEBUG: Guest vnc://[3ffe::102]:5901 has a vnc display

** (remote-viewer:26689): DEBUG: After open connection callback fd=-1
** (remote-viewer:26689): DEBUG: Opening connection to display at vnc://[3ffe::102]:5901

** (remote-viewer:26689): DEBUG: notebook show status 0x10ef090
** (remote-viewer:26689): DEBUG: Disconnected
** (remote-viewer:26689): DEBUG: close vnc=0x1130f60
** (remote-viewer:26689): DEBUG: notebook show status 0x10ef090
** (remote-viewer:26689): DEBUG: Guest vnc://[3ffe::102]:5901 display has disconnected, shutting down
** (remote-viewer:26689): DEBUG: Set connect info: (null),(null),(null),-1,(null),(null),(null),0

can't connect to guest,the bug not fixed.

> <graphics type='vnc' port='5901' autoport='yes' listen='0.0.0.0'>

You have told the guest to listen on a IPv4 address, so of course you can't connect to it using IPv6.

thanks daniel,
I change listener to 
 <graphics type='vnc' port='5902' autoport='yes' listen='::'>
      <listen type='address' address='::'/>
    </graphics>
remote-viewer can connect the guest
vnc verification passed.
waiting for spice-gtk latest build to try spice guest connection.

vnc support ipv6 now, spice-gtk not support this on rhel6.3,bug 813865 will fix on
rhel6.4, so move this bug to verified, when 813865 fixed,will add comments on this.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2012-0772.html