Why does only one network adapter ever get DHCP IP address?

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http://unix.stackexchange.com – I am using a Panda Board which is running a build of Angstrom. The Panda Board has an in build Ethernet port and this is working fine, getting a DHCP address successfully. I am going to be housing it in a larger container than the one supplied, which won't give me access to the internal port, so I am trying to use a USB Network Adapter. Angstrom correctly identifies the adapter but it never gets a DHCP address. I've tried connecting both and just the USB one, but only the internal one will ever get an address. Can someone help me? I'm new to linux! (HowTos)