On the XP box my IP table is as follows:
subent is 255.255.240.0
default gateway is 18.104.22.168
Now I can't say about the DHCP (I'm not sure how widely it's used here in the UK - I'm sure that someone will tell me!) but, in my case I have a static IP (I'm presuming that your's is dynamic, hence the DHCP facility), but that goes into my modem/router (which only has one port) which in turn plugs to my hub (a clever "splitter"), which plugs to my PC (plus my network printer - but we'll leave that for the moment).
Now, my ISP provides the IP address that terminates at the modem router - inside that, it set's it to the internal LAN ip for the default gateway address, which would be for example the 10.0.0.1 that I mentioned earlier. Now ignoring the fact that I have a seperate hub from the modem router, I would then use an internal IP address that is in the same range as the default gateway for the PC, as that is what the modem router is looking for i.e. I'd use 10.0.0.2 -now as I dual boot, I can use the same IP address for the windows install as well as the Mandrake (I changed it between your answers, because the gentoo I had earlier is considered a "power user" distro - hence, well over my head).
But, because you have more than one pc connected, logic would dictate that you would use 10.0.0.2 10.0.0.3 and 10.0.0.4 (I just find that the sequential numbering makes life a little easier). Also, because I don't run any servers or stuff like that, I use the external IP of my service provider for my DNS
I'm guessing, but what you're refering to as a hub is probably the cable modem with a hub built in (though I could easily be wrong). As the two pairs of IP's are
it looks like 1 is your's and 1 is her's. If you see the only difference between the pairs of numbers, is the 3rd number i.e. 1 and 10, I'm guessing that these are main and alternative/secondary.
So if you tried 24.226.1 95 and if your "LAN set up" enables you, also put in 22.214.171.124 you may get what you are after (you may only need the .1.95 number, but you might need both, you also might have to access the "hub" to tell it that the extra plug/access point has been used and what IP you have allocated to it - my router/modem has a web based access).
It looks like your cable comes in, plugs to the modem/router/hub - the numbers look as if the device takes the original IP, then changes that to the default gateway, which in turn is changed to the DHCP IP address which see's the LAN address's - so it sort of works in a similar way to my system.
Now, also, as you haven't identified which distro you're actually using, and getting the impression that you're in the states - it feel's like you're using redhat 6, if so, that's pretty ancient. even if you did manage to connect , you'd probably have a small mountain of updates, security patches and bugfixes to install,and as I haven't got a clue about the various comments in respect of your d-link card (though this thread isn't the only one that i've seen them criticised in) I'm gonna suggest that you get down to your local big computer store, (and if necessary bullshit them that it isn't working) and replace it with either a 3com or something like that (mine is a netgear model) and at the same time, get the most up to date linux distro they have - if they dont stock linux disc's get them off the net.
The cheap ones you see advertised like 5 to 20 $$$'s a set will be burned copy's of the download version (which you could do yourself if you have a cd burner - even with windows). Personally, I have mainly gone for "original boxed set's" (mandrake powerpack's), because they often have a few extra bit's that aren't available in the download version (and as for distro, I'd recommend Mandrake being the easiet for "the newbie", the hardware detection is good, the set up is straight forward, and there's absolutely loads of help here).
Sorry if my post is a little long winded - I've tried to make it as if I'm standing over your shoulder. Id say my recommend is good and my suggestion to get your system connected is best guess.
Hope this helps, if not, sorry to have wasted your time!
p.s. Oh, I'd read any documentation for your hub/cable modem device, and see if it has any firewall capability. If any of the IP address are public network one's, most people ***** them out as a security measure, internal ones don't matter too much, they can usually be changed - just a thought!