I'm working the same problem. ATT right? I have to set up my Airport Express as:
Connect using DHCP
Router Mode DHCP and NAT
This will show a status of Double NAT but it works. I'm going to try my Airport Extreme tomorrow. I'll let you know how it goes.
Also...since the 3360 does the PPPoE I do NOT use PPPoE on the Network set up of the computer.
This is the link that got me started:
Message was edited by: Barn-Dawg
I suffering through a long time of SLOW ATT DSL Pro, with the DSL signal cutting out alot, and I had multiple job repair tickets opened by ATT. ATT, afterr running tests from their office, said I should buy a new DSL modem, so I bought the Motorola 3360 they told me to buy yesterday, knowing I had an ATT service guy coming today. This fellow did five hours off work, including work on the outside of my building, installing a DSL filter in my basement where DSL came in and a bunch of other stuff. Then the Motorola 3360 was causing so much noise on my phone line he brought in a second ATT guy who deemed the Motorola unit to be defective and he installed a different new modem, a Westell 6100. After they left I got the Airport Extreme working, but we did NOT use the Bridge Mode.
Thank you for reply. I hope you get your set up working!
Double NAT is usually not too serious of an error on a simple home network, but the multiple NAT layers will slow down the network a bit. I don't like it, but there are lots of other users who run their networks this way.
If you plan to play online games with a product like an xBox, these consoles will not tolerate a Double NAT on the network.
Firmware updates and software updates requiring an Internet connection may not download and install correctly with a Double NAT....one of the reasons why we likely see posts from users everytime they try a firmware update.
When the modem is used with another brand of router, AT&T is very clear that they recommend that the modem be placed in Bridge Mode and the PPPoE connection service be set up on the router. See example in link below:
You won't have any Double NAT problems this way, and the network will run more efficiently.
I have used a Motorola 2210 for about 4 years and thinking that it had about lived its useful life, I bought a new modem. The 2210 is no longer available and has been replaced with the Motorola 3360.
The 3360 setup in Bridge Mode exactly the same way as the 2210 and it has been solid as a rock for the past 4-5 weeks since it was installed. I did not change the configuration on my AirPort Extreme at all....just used the same settings I have been using for the past 4 years or so.
Now the disclaimer......your results may vary.
As I mentioned, we ended up having an ATT service rep come to our place. It turned out:
1) our original modem was not defective afterall (it was a Speedstream 5100 that was 7 years old), we had outside wiring issues that had to be corrected that were part of our extremely slow internet connection,
2) the NEW DSL modem we had just bought, the motorola 3360, WAS defective, so they said "Here's a new Westell 6100 modem, let's install it as it is so much newer that your 7 year old Speedstream modem".
but the BIGGEST thing we learned from the tech that is that ATT HAD CHANGED OUR PASSWORD when we tried to install the new modem AND WE DID NOT KNOW IT....the tech rep told us this, and once we understood what our new password was, it was relatively smooth sailing, though the tech rep said "ATT's software is not always the best with MACs". He used what he called "software workarounds" and he quickly finished the installation.
So first call ATT and find out what new password they assigned you when you tried to install the new modem. This was our single biggest issue!
If you changed the setting on the modem to "PPP is on the computer or router", then you must also change the setting on the AirPort for Connect Using to "PPPoE" and enter your connection credentials.
For AT&T, your user name is almost always your email address with the provider.....not your account number as some folks think....and the password is up to you. You may need to call AT&T to reset the user name and password if you are not sure about things.
Your discussions and details here have been very helpful. They closely mirror the situation I saw while upgrading my mother's DSL modem from an older Westell model to a Motorola 3360. We were very happy when we got ours from AT&T.
Once that was working, we also attempted to install a Netgear WGR614 wireless router.I really did want to put the modem into Bridge mode, having done this before with other routers (e.g., Linksys.) However, we ran into problems very similar to those described here. Plus we battled South Florida thunderstorms.
Occasionally the modem's INTERNET light isn't on at all unless we disconnect and reconnect the power. I do not remember if this happened when only the modem was connected, no router. I decided to reset everything on both the modem and router, let the modem handle the PPPoE and put up with the double NAT's.
I would have tried your solutions further, yet had to return to my home in California. (Another reason to visit Mum?!)
One slight gotcha. Since passwords were mentioned, the password for the modem is not the same as the one for the AT&T account. This may be obvious to some of you, yet one AT&T rep we spoke to didn't make the distinction.
Thanks for everyone's thorough advice and descriptions. (And patience.)
I hate to bump this thread, but I went through setting one of these up with the new Airport Utility 6.0 and wanted to share how I set it up for anyone googling.
I put the modem in bridge mode. This is a must. Once I did that, I connected it to the airport, and the airport via ethernet to the mac mini.
In the Airport Utility, I set up the PPPoE Settings. The password, however, wasn't the ATT Account password, rather it was the "network password". ATT can give it to you if you call them. This was our biggest hang up.
You will know you have the network password wrong if the green light shows up but the internet doesn't work, and loading a webpage automatically takes you to the ATT password update utility. The utility is broken and will hang, so just use the network password provided by ATT.
After that's done, click on system preferences, network, then ethernet, renew your DHCP lease (just in case) and you should be good to go. Now you can test your connection, or connect via wifi. If you have any further questions, let me know.