Here's the situation

My DSL connection to the internet is masqueraded among a network with one of those local 192.168.xxx.xxx numbers behind a router..........

what I want to do is run a service on MY computer (which is masqueraded), but it doesn't have a real IP address that's accesible from the internet, so requests can't be sent IN to me.

THe even bigger problem is: i DON'T have access to the router.

Is there a way I can run a service and have it be accessed from the outside?

Maybe use a VPN somehow? or Tunnel requests to my computer, having my computer first initialize the tunnel with an outside linux box, and then send requests to the outside linux box and send them through the tunnel to me?

Any suggestions?

you can do all kinds of stuf, but you need to setup router, without that, you won't be able to do much