Does the "ISP router" have SSH?
In this case I would do like this:

that is a solution, but no, no ssh on the ISP router :/

If the ISP router doesn't have SSH you will have to ask to the LiMe
router owner to give you a way in...
For example a reverse SSH (with -R option) executed on LiMe router
pointing to a reachable SSH server.

That is a good temporary solution!

I tested from my test router here:

ssh -R 9000:localhost:22 nuvem@nuvem.tk

(nuvem.tk is a host i have ssh access)

then i ssh into nuvem and from there did

ssh -p 9000 root@localhost

and i was at the router prompt!

using keys, i probably can put it as a startup script and have a permanent tunnel---

Or including the LiMe router in a VPN (for this the GSoC idea about
integrating LibreNet6 with LiMe would be perfect to have).

Well, that what we used to have, just ssh directly using librenet6 tunnel. Much simpler.

Then I lost the private key, and uploaded a new one to the github.
But for some reason it is not working, I don't know if something has to be done on their side :/

Hope this helps!

It helped a lot, thanks!

bruno@pobox.com ▀─█▄██▄▀▄
http://brunovianna.net ─█▄██▄▀█▀█▄
skype: randomico▀─█▄██▄▀█▀█▄▌██─█▌█▌