The answer you want lies within your router or DSL modem. Generally, if you are using any type of firewall or NAT your addresses are "non-routable" private addresses. In order to access a machine on the other side of the router, you will need to set up a router or other service to provide PROXY services, that is it will take a public address and map it to a private address on the other side. Be very careful what ports and applications that you want to proxy as if left wide open your protection is shot.
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