i recently used netviewer (http://www.netviewer.de). this is a very interesting product, that allows other users to access your pc and (if allowed) vice versa. also copying files to the "parnter" is rally easy.
BUT the real clue is that this also works if both pc's are behind a firewall (at least with most firewalls it seams to work - netviewer writes that on their homepage)! I guess (i'm pretty sure) that both pc's communicate with the netviewer's server. both use the same "registration number" to enable the netviewer's server to know which partners belong to each other...
i haven't sniffed the packets yet and therefore i don't know anything about the internals of how they (netviewer) are doing this.
now my question:
- is there any existing solution that could do something simillar (regarding to the firewall-problem) with VNC? (assuming that i have access to an internet server where some kind of software may be started)
- does anyone know how this is done exactly (in details, so it would be a good starting point to programm such a server myself - or at least some keyword for the used technology/method).
please also assume that both partners do NOT have access to their firewalls (so port-forwarding is not possible). the firewalls both allow the pc from the internal network to access the internet by port 80 (and doesn't do any wild content scanning to check if the data really is http).
i'm happy about any hints!
thanks in advance, raphael
p.s. what i could imagine (but i think it's to easy to be the solution): a server-program that runs on an internet-server. this app listens on port 80 and allows both pc's to connect to it. because the client connect, they are allowed to pass the firewall... then the server-app just forwards the contents of all packets received from pc1 to pc2 and vice versa...
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