Access Router UI behind another router without setting up port forwarding

Access Router UI behind another router without setting up port forwarding

Ok, I'm sure this is a strange scenario. I hope some of you gurus can help
me brainstorm a solution. I have an OpenWRT router. It is behind another
router that I don't have control over (and can't setup port forwarding
on). My router hosts a web UI for configuration. The router that my router
is plugged into is plugged into a modem that does not have a static ip
address. So, it looks something like this:
Modem (with Dynamic IP) --> Their Router (192.168.1.1) --> My Router
(192.168.2.1)
So, I would like to be able to configure my router from the internet. How
can I do that? I have full control over my router. I also have control
over an internet facing linux box. Is there some way I could have my
router ssh into the linux server and use the static ip of the linux server
to access my UI? Just to be clear...I don't want to ssh into my router, I
want to access the User Interface of it. Thanks for any ideas you can
offer!
EV