Thanks guys.
Yeah, I didn't explain it too clearly it seems. That is because that is not my usual area of work and it is still all "Greek" to me.
Ok, I shall go back and read the posts again, but as good as the replies are, they are not "specific" enough to really help me.
Ok, the setup:
I have about 5 machines all on my LAN. THERE IS NO OUTSIDE ACCESS. I didn't say my ADSL LAN. It is just a LAN. LOCAL being the important word here.
All the machines have their FIXED IP numbers.
One machine gets teathered to the internet via its 3G. This is on a USB port.
I asked else where:
My internet is done from a USB port.
I want to share that connection to my "LAN".
I can't remember what it is called, but could someone help me set it up?
And this is what I got:
its generally called bridging.
So reading the replies here, I would say that is not exactly the right thing for me to do.
I've heard of ICS (Internet Connection Sharing) as well, but that is just as confusing/unknown to me as bridging, and when the reply came back saying it is "bridging" I went with that.
So, what's the problem I am having?
Well, my LAN works. When I connect/teather my phone to the/a computer (usually the same one) the computer's IP address changes. WAY WAY changes.
I don't understand why when I think about it.
The phone connects to the net. Not the computer. Outside the phone has an IP address it gets from the "3G" system. Back towards the computer it doesn't really matter what IP it has. So, if I can tell the phone to be a particular IP address - within the range of my LAN - all would be good.
But I don't know which is the easier path now. Do I go with this ICS, NAT stuff, or can I simply tell the phone to use a certain IP address towards the computer?
(HTC Desire OS 2.1 - can't upgrade to 2.2 for some weird reason. HTC's site says the IME is not accepted. That's another story. Just so you don't give me instructions which are only in 2.2 though.)
All this talk about wireless modems/routers, etc. Yeah, nice, but that isn't where the "internet" connects to my LAN. It is through the phone and the computer into which is it plugged.
Now, something else (added via edit) DNS.... When I go into my "network settings" and click on the TCP/IP and then properties I get the screen where I can set the IP as either fixed or from a server. Then it has a "Default DNS" (or something). DNS, yeah, Domain Name Server. I have fixed IP addresses and the LAN works. WHY/HOW this works I don't know. But I have set it (in all machines) to this one computer. Is this right or wrong?
I don't think I can leave it blank.