[CentOS] vncserver on IPv6

Rob Lockhart rlockhar at gmail.com
Thu Aug 14 00:14:26 UTC 2008


On Tue, Aug 12, 2008 at 10:57 AM, Robert Moskowitz <rgm at htt-consult.com> wrote:
>
>
> Rob Lockhart wrote:
>>
>>        In /etc/sysconfig/vncservers I have something like this:
>>
>>        VNCSERVERS="1:myusername"
>>        VNCSERVERARGS[1]="-geometry 1400x1050 -depth 16 -localhost"
>>
>>        (so I can only use localhost, which means I only allow
>>        connections over ssh or from the local machine).
>>
>>        Yours might be something like this:
>>
>>        VNCSERVERS="1:robert"
>>        VNCSERVERARGS[1]="-geometry 1400x1050 -depth 16
>>        InTransports=IPv6,IPv4"
>>
>>
>>    Well first my line has [2].  I changed that to [1] and tried all
>>    sorts of variants to the above, including putting a - infront of
>>    InTransports (like other options), and replacing the = with a
>>    space.  No listening on IPv6.
>>
>>    I have foudn the RealVNC support mailing list and sent a question
>>    there, hopefully to get answers.  But if anyone has anything to
>>    suggest here, please do.
>>
>> I recently reinstalled VNC - actually "TightVNC" as it's better than VNC
>> for bandwidth.  If you type "Xvnc -h" you'll see all the parameters
>> supported.  I didn't see any options for IPv6 in my version.  But yours
>> might indeed have more options.
>
> Using this method, I don't either, though the help is -help, not -h, but
> there is -multicast for IPv6 multicast for XDMCP
>>
>> I noticed that the default /etc/init.d/vncserver script seemed to be
>> ignoring my parameters for VNCSERVERARGS as in the log file, it showed
>> listening for all hosts (not just local hosts).  This was confirmed by
>> connecting directly from another machine to the VNC server port (:1 which is
>> port 5901).  I had an older version of the vncserver script, and I overwrote
>> the one from the repository with that one, and it took my parameters.
>>  However, the parameters I can confirm are working are:  "-nolisten tcp
>> -localhost -desktop RobHome -geometry 1280x1024".
>>
>> First, verify via "Xvnc -h" that the parmeters for IPv6 are supported
>> (InTransports).
>
> BTW, I note in the -help messages that parameters are case insensitive.  Or
> that is the claim.
>>
>>  Next, could it be possible the ip6tables is blocking you?  My network
>> doesn't use IPv6 so I don't think I could retrace your steps.
>
> No.  Port 5902 is specifically accepted in both iptables and ip6tables.  And
> I have tested this using another app that I have bound to that port (but is
> not running when I try out vncserver).
>
> And no answer on the vnc support list....

Going to google, "tightvnc IPv6":
http://www.tightvnc.com/related.html
which then points (at the bottom):
http://jungla.dit.upm.es/~acosta/paginas/vncIPv6.html

so it looks someone has compiled TightVNC with IPv6 support.

Try the new font fix, and see if it works....
   -Rob


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