Airport express
From Amahi Wiki
Apple's Airport Express has some funky settings that make it hard to use with other networking devices, including your Amahi server.
There is no option to disable the DHCP in the Airport admin tool, so what you need to do is
- Set the pool of addresses to only one address
- Set the lease length to 8000 days or something long
- Have a computer request an address while your Amahi HDA is offline
- After that, put Amahi back online
- Disconnect the Airport Express
- Have that same computer request an address
- After that you can turn on the Airport Express