Change Negotiation speed

How does one, using the latest Airport Utility, check the port speed settings on the Airport Extreme?

Apple removed the WAN port setttings in AirPort Utility 6.x in favor of a default setting of "Automatic" with no ability to change things....so it is not possible to check the port settings at all.

If I connect the cable modem to directly to my MacMini I get 10.0mps but when I put the Airport Extreme between the modem and MacMini my speed is 4.0mps.

Is this using Ethernet to connect the MacMini to a LAN <-> port on the AirPort Extreme....or....are you connecting the MacMini using wireless?

What is the make and model number of the cable modem?

Thanks for the additional information.

About all that you can do is perform a Hard Reset on the AirPort Extreme to clear out the old settings and then configure it again to see if that helps.

To perform a Hard Reset, with the AirPort Extreme powered on....hold in the reset button for 9-10 seconds and release. Allow a full minute for the AirPort Extreme to restart with a slow, blinking amber light.

Now reconfigure the AirPort Extreme again. If you have a spare Ethernet cable, go ahead and try that as well....you never know with Ethernet cables.

If you try the Hard Reset a few times and this results in no improvement, there is really nothing left to do but try another router. Or....if you have another Mac running Leopard or Snow Leopard, you could use AirPort Utility on that Mac to try some different settings for the WAN port.

Please post back on your results.

As a test, stick the switch between the modem and the AE... a 10/100 switch is ideal for the job but even a gigabit switch should show port speed via da' blinkn' lites.

Even better of course would be a managed switch. But that particular model motorola cable modem does seem problematic with apple routers.