[ubuntu] VNC to internal computer w/ "vncviewer -via"?

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http://ubuntuforums.org – I'm trying to VNC into a computer that does not broadcast it's ip address. I can ssh into it though, for example, by first ssh'ing into a computer that does broadcast it's ip address. Someone told me the following would work: Code: vncviewer -via user@externalhost internalhost but I get: Code: channel 3: open failed: connect failed: No route to host vncviewer: VNC server closed connection Googling has not helped. Any suggestions appreciated. Thanks. (HowTos)