Arg! Airport Extreme to Extreme- Can't Connect via ethernet

Hello- Arg! Frustrated and can't figure out what's going on.
Goal: Wirelessly connect an airport extreme to another airport extreme and use the 2nd Extreme as a local wired hub.
Problem: Everything works fine, but any machine that is hooked up to the 2nd extreme isn't getting a DHCP assigned and can't see it. But wireless can see it and works great.
Setup: (here goes)
- Airport extreme 1 (AE1) is hooked up to a comcast cable modem. Works great
- Airport extreme 2 (AE2) has been configured to wirelessly join AE1- This also works great.
- 2 Mac pros are connected to AE2 via ethernet cable
visual example:
(comcast) - (AE1) ~~ (AE2) - Mac pros "~" = wireless, "-" = wired
I've tried different machines and cables... no luck. If I reset AE2, they can all connect.
What am I doing wrong here... seems like ethernet is being disabled.
All AE have been updated and along with computer software. All wireless works fine.
Thanks!
Message was edited by: mr.bill

Got it... Instead of joining, I had to select extend and ensure that AE1 had extend network enabled. Seems to be working now. Sweet!

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o Power-on the modem. If it has one, press and hold the modem's reset button for at least 3-5 seconds. After power-up or reset, wait at least 10-15 minutes.
o Power-on the AEBSn; wait at least 5-10 minutes.
o Power-on the computer(s).
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Like that user, I have Xfinity. The other user had received this assistance from Comcast tech support (Which is sad that Comcast was more helpful than ... anyone ... but especially Apple), so if it doesn't work they should be able to help fill the gaps. Chances are, you may be better off getting assistance from your ISP than from Apple.
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2. Click Edit on your AEBS icon.
3. Click the Internet tab.
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7. Save changes, Update the new settings, and let the AEBS restart with the new changes.
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Here's the post that fixed it. https://discussions.apple.com/message/21916742#21916742
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Message was edited by: Crimsondude

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o Power-down the modem, AEBSn & computers. Order is not critical.
o While the power is off, check to see if the modem employs a backup batter. If it does, temporarily remove it, and then, replace it.
o Power-on the modem. If it has one, press and hold the modem's reset button for at least 3-5 seconds. After power-up or reset, wait at least 10-15 minutes.
o Power-on the AEBSn; wait at least 5-10 minutes.
o Power-on the computer(s).
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Happy Holidays

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Arg! Airport Extreme to Extreme- Can't Connect via ethernet

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