VNC - how to accelerate

Hi,

I'm using VNC over an OpenVPN connection to do home-work.
Connection is around 1 MBit throughput synchronous.

server: LibVNCServer 0.7.1 (Linux - SuSE 10.0)
client: xvnc4viewer 4.1.1+X4.3.0-21 (Linux - Debian Etch)

It works but I want to know if there are some tricks to accelerate
the connection.
The only thing I did was to start the vncviewer with the LowColourLevel=1 (64 colors).

May be there are some other measures to speed up the connection.

Do other options beside VNC exist to access the remote X system ?

Thomas

R.P. wrote:
> Hi,
>
> I'm using VNC over an OpenVPN connection to do home-work.
> Connection is around 1 MBit throughput synchronous.
>
> server: LibVNCServer 0.7.1 (Linux - SuSE 10.0)
> client: xvnc4viewer 4.1.1+X4.3.0-21 (Linux - Debian Etch)
>
> It works but I want to know if there are some tricks to accelerate
> the connection.
> The only thing I did was to start the vncviewer with the LowColourLevel=1 (64 colors).
>

There are a fair number of different vnc servers and clients, with
varying support for compression systems. Personally, I've used TightVNC
(between windows systems mostly, but these are cross-platform programs)
which has a number of tighter compression options. Check what your
server-client combination supports, and consider TightVNC as an alternative.

Also consider what you are sending over the link - avoid trying to do
heavy graphics.

> May be there are some other measures to speed up the connection.
>

On the vpn, you can enable comp-lzo for compression. It won't help if
the vnc traffic is already compressed, but it can help for other traffic
over the same link.

> Do other options beside VNC exist to access the remote X system ?
>

Google for nomachine and freenx.

> Thomas

On 2008-03-21, R.P. <(E-Mail Removed)> wrote:
> I'm using VNC over an OpenVPN connection to do home-work.
> Connection is around 1 MBit throughput synchronous.
>
> server: LibVNCServer 0.7.1 (Linux - SuSE 10.0)
> client: xvnc4viewer 4.1.1+X4.3.0-21 (Linux - Debian Etch)
>
> It works but I want to know if there are some tricks to accelerate
> the connection.
> The only thing I did was to start the vncviewer with the LowColourLevel=1 (64 colors).
>
> May be there are some other measures to speed up the connection.
>
> Do other options beside VNC exist to access the remote X system ?

Consider using an X client over ssh. I can't help you with the setup,
only having done that with a Windows client.


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Am Fri, 21 Mar 2008 14:49:27 +0100
schrieb David Brown <(E-Mail Removed)>:

>
> On the vpn, you can enable comp-lzo for compression. It won't help if
> the vnc traffic is already compressed, but it can help for other traffic
> over the same link.

I tried this at client side but got:

"Bad LZO decompression header byte: 42"

Must this option "enabled" by the openvpn server too ?

>
> > Do other options beside VNC exist to access the remote X system ?
> >
>
> Google for nomachine and freenx.
>
Currently I try freenx but it is still not working...

Thank you.

R.P. wrote:
> Am Fri, 21 Mar 2008 14:49:27 +0100
> schrieb David Brown <(E-Mail Removed)>:
>
>> On the vpn, you can enable comp-lzo for compression. It won't help if
>> the vnc traffic is already compressed, but it can help for other traffic
>> over the same link.
>
> I tried this at client side but got:
>
> "Bad LZO decompression header byte: 42"
>
> Must this option "enabled" by the openvpn server too ?
>

Yes, both ends must support the same compression techniques! But I
believe most vnc servers and clients will negotiate for compatibility.

>>> Do other options beside VNC exist to access the remote X system ?
>>>
>> Google for nomachine and freenx.
>>
> Currently I try freenx but it is still not working...
>

I'm not an expert on freenx, but I believe it is the best solution for
low bandwidth remote desktops, so keep trying!

> Thank you.

Am Sat, 22 Mar 2008 09:43:13 +0100
schrieb David Brown <(E-Mail Removed)>:

> R.P. wrote:
> >>> Do other options beside VNC exist to access the remote X system ?
> >>>
> >> Google for nomachine and freenx.
> >>
> > Currently I try freenx but it is still not working...
> >
>
> I'm not an expert on freenx, but I believe it is the best solution for
> low bandwidth remote desktops, so keep trying!
>
Now it is running (I simply installed the latest rpms from nomachine and not the one
from my SuSE distribution) and it runs really fast !
Seems to be very good !