Yep, it all boils down to port fowarding. In many places also.
The ISP normally blocks most ports for internal servers which the emu doesnt use so you dont have to worry there.
Next is your DSL/CABLE modem. Some are configurable. My DSL modem has a page where you can set up Port Forwarding to allow incoming traffic to be directed to a certain internal IP. In my case, it would be set to the router that follows after it as its the only thing that is connected to it. It assigns its connections to be 192.168.254.2 and beyond, so I point it to that IP as thats my router.
Next would be to point your router to allow incomming connections for certain ports to be pointed at certain computers. It assigns IPs like 192.168.2.2 and up. I have two computers and I use BitTorrent on both so I have set up ports 36363 to point to my laptop and 52525 to point ot my desktop, as the BT clients are set to use those ports on each computer. Next I set up ports 7000-7100 to point to my desktop as thats where my server is running.
I dont know exactly if any ports are needed to be opened with World.exe, as I have yet to have the ability to test connectivity to my server from a outside the LAN source. Some please elaborate on this. If your using the minilogin, you will need to find out what your IP is on your laptop, add it to the MySQL accounts table, and then besure to port foward 5999 in all the above locations, or what applies to you.
Also, there is firewalls that can block traffic on ports not allow by it. Although it is not good to disable firewalls, try this as a last resort if it does not work.
For the minilogin, edit your eqhost file, and tell it to point to your homes external IP. From your house go to
http://www.whatismyipaddress.com/ to find out what your external IP is. Put this in your EQhost file along with port 5999. Dont know if this works exactly, but I would assume in theory that it would. Correct me if I am wrong.
I am digging deep into my network port knowledge for this so some of it may not apply to the emu, but its just kinda overall general knowledge.