Re: Is there any thing like Bubbleip

From: Walter Roberson (roberson_at_ibd.nrc-cnrc.gc.ca)
Date: 04/18/05 

Date: 18 Apr 2005 18:21:57 GMT

In article <1113820167.386500.160010@z14g2000cwz.googlegroups.com>,
 <premdeepbanga@gmail.com> wrote:
:that means i cannot set up my vnc connection if i am inside a NAT, and
:it only allows outward connection & no inward.

Yeah, it's certainly an obstacle.

:Now suppose i use a dialup(only clients), and i setup the VNC server, i
:buy a public ip, setup the server, install the VNC server. Now can the
:clients using dialups(first scenerio) connect to my vnc server, which
:is public, and can i access through VNC to the clients using the
:VNC(assuming the clients are running in server mode). If its possible
:then how can i proceed.

I don't know the VNC protocol particularily well, but I think the
approach you are describing would work in the one-to-one
NAT case I described but only in the case that the firewall allowed
inward access. If there's a real Stateful Packet Inspection firewall
in place, then what you suggest won't work, as even when the same
remote host is involved, you often aren't allowed to initiate
inward connections, except in the case that you are using a protocol
such as FTP that the firewall has special monitoring to handle. I
don't recall that VNC has a suitable protocol for this kind of activity.

What you describe would work in the static-NAT cases, but only if the
firewall administrator permitted the traffic.

Just having -a- connection outward to a server is not -usually- enough
for connections to be permitted back (though it is in older
stateless NAT devices.)

You have specifically mentioned tightVNC a number of times. Is your
project wedded to tightVNC? Or are you just looking for -some-
sharing mechanism? If so, what platforms do you need to support?
The sharing mechanism you are aiming for has been implemented by
gotomypc.com. I believe gotomypc.com is not free, but you might wish
to check to see whether the services it offers are the ones you
are looking for. If so, then you can save a lot of explanations by
just asking, "Is there a free equivilent to gotomypc.com?" ;-)

The functionality you are asking for has been implemented many times,
and copies of the software have often been given away for free.
For more information, see any good security site for information
on the Sub7 trojan and kindred software.

I know, I know, that's not exactly what you meant -- the point is
that lots of people have done software that connects to a central
server and allows other people to connect back and see the screen
and control it. You can probably find source online somewhere.

And if you have the tightVNC source and using a customized version
of tightVNC would be acceptable for your purposes, then you could
add the functionality in to tightvnc. For example, the tightVNC client
could connect outwards, and then upon negotiating the proper [new]
handshake with the tightVNC client, the client could fork() to
the server with a parameter that would tell the server "Use the
existing connection instead of waiting for a new connection." In
turn the server would do the same sort of invocation of the client.
The appropriate windows pop up, and what was the destination takes
control of what was the source. 

-- 
Would you buy a used bit from this man??

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