Q: changed network

Our ISP is Vodafone NZ we have one IP address and we are DSL.

The second router has its own wireless network.

We have stopped trying to configure the devices to each network and are only concentrating on the primary.

We have now successfully updated the AP Express and it is now working with ITunes on the primary network.

Still trying to make the TC do the same thing.

Frustration again. Cannot get TC to show green no matter what.  Have checked settings on router the only difference is the security settings on the router is WPA-PSK the TC does not offer that option also under Network mode the choices are "create network"  Extend network" or Off" nowhere does it seem to say "Join existing network"  as AP Express.  It shows up sometimes on Airport Utility but when I make changes it just vanishes again.

Once I stated messing with TC, the AP has now ceased to work despite showing green on the device.

It still shows in AP Utility but with yellow warning triangle and nothing shows at all on ITunes.

It has to be something simple!

Just thought of something else.  Generally my MacBook Air is permanently connected to router by ethernet.

Should I disconnect this cable when using WiFi network?

Just had another look in the router there is a security setting WPA2 -TKIP+AES should I use this?

we are in New Zealand.

I have switched off the wireless network provide by the router and concentrated on trying to join my devices with the remaining "guest" network, no luck there either.

it looks like this new router simply will not allow these devices to work.  I have all but given up, the AP Express sometimes joins but mostly not, obviously a compatibility issue.  The TC simply will not work.

This is nuts, yesterday i successfully changed all settings on both AP Express and TC after hard resetting them both. They both instantly recognised my network, joined and happily worked correctly.

Don't ask me what I did differently!

HOWEVER!  This morning when I switch on the network NEITHER device works!

They both show in Airport Utility with the big yellow triangle.

Does this mean I have hard reset and reconfigure them each time I switch off the wireless network?

Should I just leave it on permanently?

As the computer is connected to the internet by ethernet is this an issue or should I only be connected by one method?

Just another thing, both devices lights are still green despite not working!

SO to sum up it it appears if you turn off the wireless network the settings in the devices are lost.

I have just hard reset both of them and again reconfigured to join the network and both have done so successfully.  What a nonsense, previously the network couldbe switched on and off at will without affecting any of these devices.  Why would this have changed?

I have been doing hard resets, there is only an exclamation mark in the triangle, when you say power cycle do you mean unplug then plugin again?

The computer is connected to the internet by ethernet cable

If these devices are to work wirelessly we need to turn on the wireless network.

At that point should we disconnect the ethernet cable or can the computer stay connected using both the ethernet and the wireless network or will there be a conflict?  Should it be one or the other?