Problem with airport configuration, ip addresses

i have an old snow base station that i am attempting to use to allow a pair of laptops to connect to the internet in my apartment.
i have manually entered the isp information into the administrator (ip, subnet, router address). however, only one of the laptops, the new macbook, is able to actually browse the internet with a 80.xxx.xxx.xx ip address. my powerbook is given a 10.0.1.x ip and while the network option in the system settings assures me that it can connect to the internet, i cannot. if i attempt to change the settings in the administrator's internet tab to allow the base station to distribute ip addresses within a certain range (instead of a single static ip) i am given an error message that says that the ip address i have used for the airport in the network tab is not valid inside the interval for ip addresses i have assigned. i have no idea what this means.
what can i do about this problem? at the very least i would like both computers to access the internet. in a best case, i would like them each to have 10.0.1.x ips. i don't know what to do and i haven't been able to find anything online that addresses this problem. please help me.
powerbook g4 Mac OS X (10.4.8) macbook os x 10.4.6

Should be simple to resolve. If your isp has assigned you a static ip address then in the Internet tab of the Snow config you should set:
Connect Using: Ethernet
Configure: Manually
IP address: <static ip as given to you by your ISP>
Subnet mask: <mask as defined by your isp>
Router address: <address as defined by your isp>
DNS servers: <address as defined by your isp>
I think from your posting this is what you have set.
Alternatively, if your isp assigned ip addresses dynamically then you should have set:
Configure: Using DHCP
and the Snow will contact the isp dhcp server to get the information required.
It is also _very important_ that you have the modem connected to the WAN port on the Snow rather than the LAN port.
Now the important bit...
In the Network tab you must have it set to
Distribute IP addresses: yes
Share a single ip address (using nat and dhcp)
Your two computers (which I understand are configured to use dhcp to get ip address, etc.) will then use dhcp to contact the dhcp server in the Snow and will be assigned addresses in the range shown in the Beginning/End boxes (which although greyed out are still applicable.) I guess these will be set to something like 10.0.1.2 to 10.0.1.200 or similar? The two machines using the addresses from this range will be "hidden" behind NAT and as far as the outside world is concerned NAT let's them share the single ip address given to the Snow on the Internet tab.
BTW the Snow will have an ip address (on the Network side) of 10.0.1.1 (you should be able to "ping" it - start up a Terminal and enter "ping 10.0.1.1").
Things will not work if on the Network tab you select "Share a range of ip addresses (using only DHCP)" and you will get the kind of behaviour you are experiencing - similar issues if you have the modem connected to the LAN port.
Why so? Well, without NAT the Snow is effectively only a bridge between two network "segments" meaning that both your machines (and the Snow "controller" function, i.e., the thing that has ip address 10.0.1.1) are part of the isp network - bad karma, you do not want to have this happen.
Now, for whatever random reason one of your machines using dhcp is still getting the Snow dhcp server and so gets a 10.0.1.x address but the other machine is contacting another dhcp server on the isp network and so getting an ip address for that network (BTW it isn't necessarily coming from a router - not all routers are dhcp servers.) Because the machine getting the 80.x.x.x ip address is then effectively part of the isp network it will be able to browse, etc. However, the machine that gets the 10.0.1.x address, although being effectively connected to the isp network, will not work because it has an invalid address on that network.
The fact that they both show connected to the same Airport network is irrelevant from that point of view, that refers only to the wireless access, nothing else.
So, to reiterate, you must use NAT.
Actually you don't have to make use of the Snow dhcp server if you don't want to. Configure the set up as defined above but then you could assign static ip addresses to both your machines provides they are outside the dhcp range. For example, if the dhcp range is defined to be 10.0.1.2 - 10.0.1.200 you could assign static ip addresses of 10.0.1.201 and 10.0.1.202 (set the mask to 255.255.255.0 and the router/dns-server to 10.0.1.1). Having static ip addresses makes it easier to setup connections between the two machines and also to use port-forwarding through NAT if yoou wanted to, say, run a web server on one of the machines or perhaps need some VPN setup.
Hope that helps.
Regards...jeremy

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