Motorola SB4200E Cable modem and AEBS no Internet connection

Hello
I've bought the new AEBS from an Apple Store in the U.S. Got back home in France thinking it's gonna be an easy ride setting up my new faster and longer range capable wireless network. After all that's what Apple says: "easy setup ... in most cases ". After ten hours trying different settings, no way to get an Internet connection !
The AEBS distributes IPs to the connected clients but cannot get an Internet address from the cable modem.
My configuration :
Motorola cable modem (SB4200E) : configured as DHCP server
Client computers:
iMac Core Duo connected to the AEBS via Ethernet
Macbook Pro Core 2 Duo wirelessly connected to AEBS
MacPro
AEBS:
Wireless Security : WPA2 Personal
Radio mode 802.11n only (5 Ghz)
Channel : Automatic
No Access control
I've tried to reboot, reset, ... the cable modem without success.
Oh forgot to say that my old 54g Netgear router is able to reach my MacPro in the bedroom where the AEBS is no show ! (Twice the range ???) and took me 30 seconds to configure.
Up until now AEBS has only been dissapointment and frustration.
Thanks for any help.

I ended up using my new AEBS in bridge mode and keep my "old" Netgear 54g for Internet connection.
Some pros though: I got a 10 MB/sec transfert rate between my wireless Macbook Pro and my wired iMac both connected to the AEBS.
Some cons: range is far from what I dreamt of (lesser range than the Netgear 54g at the same location in the room)
My HP Laserjet 1020 Printer sometimes shows up in the "Printers pane" and suddenly disappears and even when it's there, printing doesn't work !
Might come from the driver though as this printer has no official driver available for OS X (I use the 1022 driver instead)
Welcome to Apple world !
Don't misunderstand my words here, I like Apple products very much, I got three Intel Macs at home, but being an Apple product doesn't ALWAYS go with plug and play. A few software upgrades might make this AEBS a very good product though.
Macbook Pro Mac OS X (10.4.8)

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