Problems sharing internet connection - works only one way...

hey all,
i'm having a problem sharing my internet connection between our "new" iBook G4 and "old" iMac G5. (both machines are running 10.4.10.) i've seen several posts here that seem related, but no answers that have worked in my case.
here's the gist:
ideally, i'd like share the internet connection from the iMac (from our cable modem) to the iBook over the airport. so, i've set up the iMac to do this under "sharing" in system preferences. i then set up the iBook to connect to this new wireless network. under "network status", it says the iBook is connected to the iMac's network, but that the iBook doesn't have its own IP address, so it can't connect to the internet.
oddly, when i reverse the process - i.e. plug the modem into the iBook and share the connection over the airport to the iMac - it works fine. the iMac gets its own IP address and can see the internet.
a friend suggests that somehow the iBook is set up to distribute IP addresses as a router, but the iMac isn't. fine. but, i don't know how to make changes to that function.
any thoughts?

well, it's taken all day - many, many attempts. but i've finally found something that worked. the answer was burried in the middle of this guy's blog page:
http://www.tuaw.com/2007/03/26/how-to-using-your-mac-as-a-nat-router/
he says:
"I've turned off DHCP and set the address to: 192.168.0.1 and the subnet to 255.255.255.192 In making these choices I was following a hint that appeared at macOSXhints back in 2002. Once this is done I went back to the Internet tab of Sharing Preference Pane, select en4 and start it.
"Now on my other device (in this case a Xbox 360) I set it up as follows:
"IP address: 192.168.0.2 subnet: 255.255.255.192 (this is the same subnet of the en4 USB interface, above) gateway/router: 192.168.0.1 (this is the address of the en4 interface) DNS: 192.168.2.1
"(here's where the voodoo comes in, I have no idea why this DNS setting works. You would think it should be 192.168.0.1, or even the DNS server of my ISP, but those simply do not work. I suspect that it has something to do with sharing over Airport as well).
"I've also found that this will only work properly if Internet Sharing is active for my Airport interface. If I turn off the Airport interface (en1), the wired interface (en4) also dies. With these settings in place, everything seems to work properly. Keep in mind you may also need to enable certain services (which will vary with your application) in the Services tab of the Sharing Pane:"
i wasn't trying to solve quite the same problem he was, but by manually inputting the IP addresses, etc, that he did, as well as randomly enabling other "sharing" options (FTP access, etc) which seemed unrelated to internet sharing, it finally worked.
can anyone explain what this is about? it all seems pretty cryptic to me. i'm not sure what i even did...
no complaints, but it would be interesting to know.
thanks!

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