Air Port Express Configuration

Hi   I am sure that this is a dumb question but hopefully someone will be able to assist me.
At my home I have three Air Port Express adaptors  - one as a base station, the others as repeaters to extend the range of the signal.  These have been configured to use the IP range 10.0.0.x and have been working OK.    The base station adaptor is both connected via a ethernet cable to my ADSL router, and is set to manage DHCP.
Over the weekend I have occasion to look at the settings for my ADSL router, I am about to repace it and wanted to get all the settings for the new router. 
I noticed that I have, as expected a dedicated IP address from my ISP, but that the internal IP range of the ADSL router was set to 192.168.0.x range. 
Surely this is wrong, and it should be set to the same range as my Air Port Express units shouldn't it, and if so I am not quite sure how the network has worked all this time.
Many thanks for any assistance
A

I noticed that I have, as expected a dedicated IP address from my ISP, but that the internal IP range of the ADSL router was set to 192.168.0.x range.
Surely this is wrong, and it should be set to the same range as my Air Port Express units shouldn't it, and if so I am not quite sure how the network has worked all this time.
In your current network configuration, you have two routers in series, each with their DHCP server service enabled. Most non-Apple routers typically provide DHCP clients with IP addresses in the 192.168.n.n range and is exactly what your current ADSL router is doing.
Since you have the first AirPort Express Base Station (AX) directly connected to this ADSL router, it will receive an IP address on its WAN port in this 192.1689.n.n range, but since it too has DHCP server service active, any wireless clients connected to it would receive IP address in the 10.0.n.n range.
You would also have a "double NAT" condition. In itself this is not necessarily a bad thing, but does tend to introduce other issues, especially if you wish to share resources between clients connected to either router. In most cases, where you have routers in series, you would want to reconfigure the downstream router as a bridge.

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