Okay, I spoke to a good friend of mine who knows a great deal about networking.
Routers...
I now know routers operate differently to switches and hubs. Routers have the abillity to read and manipulate the headers of a packet of data, where as switches, like I said before, simply read it and then pass it on to the correct destination.
So yes it is possible to have a router as an internet gateway, which I find very cool

although in terms of costs, they are much more expensive than switches or hubs.
Now, after considering this, I have come to the conclusion that it would not change the way EQemu works over a network, however I donot know yet if they expose your home network to the outside, as many people use them in conjunction with high-speed internet (ADSL, Cable, Satelite etc.) and you can see what this would cause. Just remember to put the host computers (The system running the EQemu server consoles) IP address in the config files and zone *.bat files.
If you cant see, then Ill tell you
If it does expose it then its best not to mouth off your home IP's as someone could potentially access your network from the outside (Internet if you will) and we all know this is a bad thing.
Again I dont know how firewalls protect networks running through a router.
Im still looking into XP networking and the Emu.
Bently