Bridge does not work for wireless clients - connecting to existing network.

Question

Hi - I really hope somebody can help out here, after hours of trial & error, I have finally given up
I need to connect my Airport Extreme Base Station to my existing network. I have a linksys router (192.168.15.1) connected to my modem and this linksys router acts as DHCP server too.
I suppose I have to use "bridge mode" for that to work. But should the linksys be connected to the AEBS using the AEBS's WAN or LAN port?
If I use "bridge mode", then wired computers to the AEBS works fine - getting an IP from the linksys etc. BUT, the wireless clients will have a self-assigned IP and not get through to the internet. It's like the AEBS will not allow wireless clients to "get through" unless AEBS itself is handing out IP addresses.
Page 36 of this manual ( http://manuals.info.apple.com/en/DesigningAirPort_Networks10.5-Windows.pdf ) shows the setup I want. But in the picture, it says "Ethernet WAN port" but the text says: "The Apple wireless device (in this example, a Time Capsule) uses your Ethernet network to communicate with the Internet through the Ethernet LAN port ( <--> )." I don't know which one to use, WAN or LAN - they show WAN but say LAN?
When I set it up as "share an IP address", the AEBS status tells me "double nat" and to change from "shared IP" to "bridge mode". I do that, and everything seems fine - for the wired clients. Now the wireless clients cannot connect, Airport on the MacBook Pro just say "Connection failed" and the MacBook says "Invalid password" (translated from danish), even though I set the Airport Utlity to save the password in keyring, so it should be correct... If I disable wireless encryption, the wireless clients will connect but get a self-assigned IP, and therefor not work (cannot get online)...
It seems the only way I can get wireless to work, is if I set AEBS up as DHCP, but then it won't be on the "same network" as the linksys (192.168.15.1), but rather on 10.0.x.x as I select. If I select 192.168.x.x within AEBS, I'm also getting some error messages, conflict/subnet thing.
Anyway - I really hope somebody knows how to get wireless clients to get an IP address from existing ethernet when connected to the AEBS.
Thanks!!

Answer 1

I've given up and had to go back to running "Double NAT" which also reports as a "problem" within the AEBS, but I just "ignore" it so the light will always be green.
It still ***** though, as "Double NAT" is also a reason for "Back to my Mac" not working properly, but how the ** am I supposed to avoid Double NAT when the wireless will not work in bridged mode?!