Cannot create Roaming Network from Time Capsule
I have a 2TB Time Capsule (4th Gen) and a newer Airport Express (MC414LL/A). I use the Airport Express to extend my wifi coverage, however, the download speeds are significantly reduced. As a result, I want to creat a Roaming Network by linking the two with an ethernet cable. Seems easy enough, but every time I plug in the ethernet cord, I get disconnected from the internet (on Airport Utility 6.1, it shows "yellow" lights on the "Internet", "Time Capsule", and "Airport Express"). By just unplugging one end of the ethernet cable (from the Time Capsule is nearest) seems to restore the internet again. The Time Capsule Router Mode is set to "DHCP and NAT" and Network Mode is "Create a wireless network". The Router Mode on the Airport Express is blocked out, but shows "Off (Bridge Mode)", and the Network Mode is "Extend a wireless network".
Please help!
Airport Express-OTHER, Mac OS X (10.7.5)