Wrong IP address being assigned via Ethernet

I have a peculiar problem, but perhaps I'm not understanding something.
My MacBook Pro connects wirelessly via Airport to my Time Capsule. I've configured the Time Capsule to assign DHCP addresses in the range of 10.0.1.100 to 10.0.1.200. Sure enough, my MacBook gets assigned an address of 10.0.1.111 and identifies the DNS server as 10.0.1.1. All is good.
Now, when I happen to turn off Airport and connect to my Time Capsule directly via an Ethernet cable for faster access, my MacBook does not get assigned an address in the specified range. Instead, it is given 192.168.15.2 when using DHCP. And it thinks the DNS is at 192.168.15.1. Is this correct behavior? Although it appears to be connecting to the Internet, I'm unable to locate my Time Capsule when choosing a backup disk in Time Machine, and I do not see it in Finder, either. Plus, I can't see my Time Capsule in the Airport Utility when using Ethernet.
Also, I was wondering... can my Ethernet and Airport connection co-exist at the same time if I enable Airport while connected via an Ethernet cable? i.e. will my MacBook default to using Ethernet?
Thanks!

SOLUTION FOUND: I had the same problem with my Time Capsule today. My TC was set for the 10.x range but all my PC's were assigne a 192.x address. Only the Macbook was able to get assigned the 10.x address. To make things even more strange the Airport Utility showed that the PC's were assigned a 10.x address. Neither the wireless or wired devices worked, only the MAC. Btw I was able to get the PC's to work by assigning the PC with the 10.x address Airport utility said it had, but this of course is not the way it was supposed to work.
I tried to restart, set settings back to default, downgraded firmware and upgraded but nothing worked. Then I called Apple Support and they asked me to do a hard restart. You do this by taking out the power and holding in the pinhole button in the back while connecting the power again. The light should blink rapidly. when this happend i released the button and set up the TC via the Airport utility from scratch.
Now it works! Thank you Apple support. I guess there was a glitch in the software and I hope it doesnt happen again.
Finn

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