Extending a network with two AEBSn 802.11n base stations

Problem: Laptop on remote Airport Extreme (n) doesn't get internet, but can see entire network.
I have set up 2 new Airport Extreme's (n). One is connected to the cable modem and set to "create wireless network" and "Share a public IP address" . The other is about 80-100 feet away and set to extend the network.
A PowerBook G4 is connected to the remote Airport Extreme and gets an IP address correctly, and can connect to a computer on the primary Airport Extreme. Transfer rates from the remote laptop to a computer on the primary Airport Extreme are strong (15-30 Mbit).
According to the Airport utility, link speed between the two Airport Extreme's fluctuates between 104 and 130 Mbit.
The problem is that the computer connected to the remote Airport Extreme can't get out to the internet. Computers connected to the primary Airport Extreme get a very fast connection to the internet. What am I doing wrong?
Airport Extreme 802.11n   Mac OS X (10.4.9)   AEBSn

Let's double-check your AEBSn's settings...
AEBSn - Extending a wireless network Setup
- If practical, place the base stations in near
proximity to each other during the setup phase. Once
done, move them to their desired locations.
- Open AirPort Utility and select the base station
that will connect to the Internet.
- Choose Manual Setup from the Base Station menu, or
double-click the base station to open the
configuration in a separate window. Enter the base
station password if necessary.
- Click AirPort in the toolbar, and then click
Wireless.
- Choose “Create a wireless network” from the
Wireless Mode pop-up menu, and then select the “Allow
this network to be extended” checkbox.
- Next, select the base station that will extend this
network, and choose Manual Setup from the Base
Station menu, or double-click the base station to
open its configuration in a separate window. Enter
the base station password if necessary.
- Choose “Extend a wireless network” from the
Wireless Mode pop-up menu, and then choose the
network you want to extend from the Network Name
pop-up menu.
- Enter the base station network and base station
password is necessary.
- Click Update to update the base station with new
network settings.
(ref: Page 45 of "Designing AirPort
Extreme 802.11n Networks.
I followed the exact instructions above with one AEBSn connected to the DSL modem and "creating the wireless network", and a second AEBSn "extending the network". Depending on the location (1st or 3rd floor), my PowerBook G4 connects perfectly to the AEBSn with the stronger signal.

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