How many computers are we talking about here? You mention 'notecards' by which I assume you mean PCcards or PCMCIA cards? Which again leads me to believe that you are using a laptop somewhere in your Network.
I am also wondering why you are using DCHP which as you probably know is a dynamic system for naming (IP address allocation from a main DCHP server) the computers and peripherals on your netrwork. To my mind this is not the most secure way odf setting up a network ("LAN" or local area network) especially when it appears that you have a Website hosted on one of your boxes. I would suggest that you use static IP addresses for each of your computers and NICs (Network interface cards, which to my mind include wireless cards and routers), again it appears from your question that you have a cable connection to two domain servers (provided by your ISP (the cable company) and you have an internal (LAN) IP address (presumeably for the the router) in the 'private' IP address range of 192.168.0.1 to 192.168.0.255 (don't use this last number in this range as it is used for 'broadcast', i.e. sending a post-it note like message to all IP addresses in the LAN that, for instance, the Web Server (Apache or httpd) is going down, or that the Server is being rebooted, etc..
Furthermore, in order to secure your wireless network from passing strangers, I would suggest that you learn about MAC addresses, which can be used to permit and/or proscribe any traffic (wirelessly) between the various computers and the peripherals.
Incidentally, when you advise the number of computers on your LAN, please also advise the names (hostname) that you have given them - 'localhost' applies to each machine internally and is not a solution - although I must admit that it should not be overwritten, just use an alias such as Dell or IBM or laptop or FC3 or whatever.
If you can describe your LAN in terms of physical layout, I might be able to help you set up a secure network. By the way do you have a firewall? Is the Linksys router 'programable'? and does it provide firewall settings?
if indeed you are hosting your own website I would suggest that you use your browser (presumeably Firefox 1.0.4) to go to www.grc.com
and run ShieldsUP (you have to click on it, and then scroll down a few items and click on that) and you will get an online report of what the rest of the world can see of your computer(s) from the internet and what ports are open on your machine.