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10.5: Screen share with multiple Macs behind one NAT
Authored by: Cobalt Jacket on Aug 07, '09 08:43:37AM

For people familiar with SSH, it's a lot simpler to use SSH port forwarding (the -L option) to achieve this. It also means not having to permanently alter your system configuration.



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10.5: Screen share with multiple Macs behind one NAT
Authored by: palahala on Aug 07, '09 09:09:25AM

On Windows, I've never used VNC without SSH, as (most?) VNC servers have no protection against brute force attacks (and thus allow for an unlimited number of attempts to guess the password).

I wonder if Screen Sharing in OS X has some built-in protection?



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10.5: Screen share with multiple Macs behind one NAT
Authored by: las_vegas on Aug 07, '09 06:21:33PM

Screen sharing requires both the login name and password then rejects login after three failed attempts.



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10.5: Screen share with multiple Macs behind one NAT
Authored by: palahala on Aug 09, '09 08:19:30AM

I did some testing with Screen Sharing enabled for standard VNC clients, like to access a Mac from non-Mac OS X systems. (In System Preferences, Sharing select Screen Sharing, and then click Computer Settings. Here, one can enable and set "VNC viewers may control screen with password".)

It seems that a VNC client can try to connect as many times as wanted.



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10.5: Screen share with multiple Macs behind one NAT
Authored by: ccjensen on Aug 07, '09 10:10:45AM

tunneling through ssh also gives the added benefit of encrypting the connection, as a vnc connection on it's own is quite insecure.



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10.5: Screen share with multiple Macs behind one NAT
Authored by: VesperDEM on Aug 07, '09 02:51:17PM

It's wonderful that you suggest using SSH to do screen sharing. However, there are some of us out there that have no clue how to accomplish this. Why not fill us in so that we can all share in your suggestion.

I for one would love to know of a way to do screen sharing on multiple computers without having to do anything to my router.



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10.5: Screen share with multiple Macs behind one NAT
Authored by: barko192 on Aug 07, '09 03:51:06PM

You connect to your ssh exposed computer with ssh myuser@myhost.com -L 5900:10.0.1.xxx:5900 where 10.0.1.xxx is the private IP (behind the NAT) of the computer you want to VNC to. This binds the remote port 5900 to your local port 5900 so when you VNC to vnc://localhost you will be able to connect to the remote computer.



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