Airport Express "Your Apple wireless device does not have a valid IP address"

[firtree]

I have cable broadband, which works OK with my old Gigabyte router. I want to change to Airport Express, but DHCP seems to be failing.

1. Unplug the old Gigabyte router which is working OK
2. Connect the cable modem to the Airport Express and plug it in
3. Start AirPort Utility
4. "Your Apple wireless device does not have a valid IP address"
5. I have
Connect Using "Ethernet"
Configure IPv4 "Using DHCP"

What am I doing wrong?

thanks

 

[gsahli]

It's not the settings on the computer - it's the Airport Express that doesn't get its IP address from the modem/ISP correctly.
Have I not understood something here?

 

[alphaod]

First off does your cable modem have a built-in router? If it does, you will need to set the Airport Express to using bridge mode in the Internet section.

 

[firtree]

I have cable broadband, which works OK with my old Gigabyte router. I want to change to Airport Express, but DHCP seems to be failing.

1. Unplug the old Gigabyte router which is working OK
2. Connect the cable modem to the Airport Express and plug it in
3. Start AirPort Utility
4. "Your Apple wireless device does not have a valid IP address"
5. I have
Connect Using "Ethernet"
Configure IPv4 "Using DHCP"

What am I doing wrong?

thanks

It turns out I wasn't doing anything wrong. After restarting the cable modem and waiting a bit, it suddenly started working.

(Thanks to the people who posted suggestions)

 

[bamaworks]

It turns out I wasn't doing anything wrong. After restarting the cable modem and waiting a bit, it suddenly started working.

(Thanks to the people who posted suggestions)

Ahh yes, the old restart trick. Works about 85% of the time.