My old Mac no longer connects to network. ideas?

I have an awesome old cube that I use to connect to the network and play music for the room it's in using the tunes library from another computer. My problem is that since I changed to a static IP on my network, I can no longer see the LAN. It connects fine to the WAN through the cable modem, which it's plugged into via ethernet, but it only uses DHCP for it to work. When I manually enter the modem's ip, (gateway/router), it gives me an error that the address is not on this computer's subnet anywhere and to change the address.
It is a long, long way to the other computer, so wiring directly is not an option. It used to connect fine with the same setup, when I had a dynamic address system. Here's my setup:
Comcast cable modem - coax to the net
Airport express - ethernet to the modem. Only one ethernet port
several wireless computers connect via Airport
Cube is plugged into cable modem via ethernet
Cube is on OS X 10.3.9 and has no wireless capability
I've tried using the subnet comcast gave me and also the basic DHCP subnet mask, but neither work. I've even tried to use the static ip of the airport ex as the router, but no.
What am I missing? I guess I could get an airport extreme, and use the extra ethernet port to connect and that would work, but I kind of think there should be a no cost solution here.
Thanks for any help,
DD

Hi Dennas,
Not sure what numbers you're using, but it sounds as if you might be confusing the Outside IP with the internal Router's IP, not sure.
Generally the one you want to use will start with 192.168.x.y, or 10.0.x.y, then it'd look something like this...
IP: 192.168.0.9
Subnet Mask: 255.255.255.0
Router: 192.168.0.1
or...
IP: 10.0.0.9
Subnet Mask: 255.255.255.0
Router: 10.0.0.1
All Computers should have the same Router IP & Subnet Mask, but only the 1st 3 numbers of the IP are the same, the 4th number has to be different, & if Static you need to set that 4th number higher than the number of computers connected+1 so DHCP ones won't get duplicate IPs.
Does that get us any closer?

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Last edited by benoliver999 (2014-02-01 18:05:31)

benoliver999 wrote:Switching off, yanking the plug then starting again did the trick. Sorry, people from the future, your solution probably isn't here.
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This question was solved.
View Solution.

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