Can't connect to computers on the same network and same office

Hi everyone, I have this problem from some time now, I have on the same network some computers with ethernet, and some with Wi-Fi.
All are connected to the C-Net Wireless-G Router.
My iBook is on the Wi-Fi zone (All have 10.4.11) and I can see the computers on the Ethernet area, but I have an iMac 2.0 next to my iBook and I can't see it.
How is that possible? Am I making something wrong with the subnet mask or IP address?
All are configured to use 192.168.1.254 as the router and on the subnet 255.255.255.0. Manually.
The IP variates from device to device on the 192.168.1.X numbers, starting with 100 on the iMac, and ending with 113 on an old 8600.
Wy can't I see the iMac?, si so close that I can reach her with my hands, but can't connect to transfer files over the network.
If anyone could give me a hand here, I will apprettiate the advice.
Thaks to everyone, Pablo from Argentina.

rccharles wrote:
All are connected to the C-Net Wireless-G Router.
My iBook is on the Wi-Fi zone (All have 10.4.11) and I can see the computers on the Ethernet area,
but I have an iMac 2.0 next to my iBook and I can't see it.
How is the iMac 2.0 connected? cable or wireless?
iMac is on Wi-Fi.
How is that possible? Am I making something wrong with the subnet mask or IP address?
You are on a different subnet. In x.x.x.0 the x's are different.
All the computers are in the same subnet, cable ones and wi fi ones.
All are configured to use 192.168.1.254 as the router and on the subnet 255.255.255.0. Manually.
The IP variates from device to device on the 192.168.1.X numbers, starting with 100 on the iMac, and ending with 113 on an old 8600.
Look at what ip addresses you have on each machine.
I have different IPs on each machine, do you need the numbers?
Wy can't I see the iMac?, si so close that I can reach her with my hands, but can't connect to transfer files over the network.
Macintosh-HD -> Applications -> Utilities -> Network Utility.app
Use the ping command to see what is going on. Ping 192.168.1.254, source & destination machine. 127.0.0.1 is an alias of the machine you are on.
!http://farm3.static.flickr.com/2575/4090068351_6fb8dc3d55.jpg"!
check out port scan. This will tell you if sharing is on.
!http://farm3.static.flickr.com/2506/4090068193_7566e620cf.jpg!
I will try this
Message was edited by: rccharles

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