I have been using the pi for almost a week now, I managed to set up the ssh connection and I have been messing around with it for a while now, it just works perfectly from my laptop (running ubuntu) using the "ssh pi@local ip from the raspberry" to the pi when I am at home, but I am unable to succesfully forward the ports on my router in order to acces the pi on networks outside my home one...
The thing is that I suspect my router is blocked in order to stop such attempts like changing the configuration in order to forward the raspberry port 22 so I would be able to use the "ssh pi@private ip from my home network" and connect to the raspberry from external networks, I can't seem to apply the changes on the router configuration page (gives me errors everytime I try to apply the forward) and it does not show any specific port forwarding tabs, thought it could actually be that I just dont know how to set up said forward.
My question might be more like a cluster of questions I guess, but, is there any alternate way to connect to the pi from external networks besides the one i plan on using? (i don't really want to give up on setting it so I could just use the afforementioned way of "ssh pi@private ip from my home network" so I guess this woul be my last shot.)
Could it be just that the router is blocked by my ISP? (using a comtrend router with its own firmware) I manly ask this one since I have been trying to do the port forwarding following various internet tutorials like this one but I got nothing but the same error over and over again. Should I in that case consider changing my router or trying to upgrade the firmware in my router?
And, in case I was just doing it wrong all along, does anyone know a good guide on doing the port forwarding configuration in order to get the raspberry working in a similar setup? (I would like to think that wouldn't be the problem but I guess I can never discard that since I am pretty new in all this, and I have been doing nothing but learning during this week run with my pi (wich proved as very gratficating experience that I want to keep on.))
EDIT: the ISP I have contracted is Telefonica, spanish based ISP.