Guest Networking solution to workaround an older non-dual band AExtreme?

When I first set up my brand new (month old) Time Capsule (TC) to Extend a Wireless Network on my pre-existing Airpot Extreme (AE-2007 version) Ethernet connected network (simple modem), the Guest Network tab showed up during my AirPort Utilities (AU) adjustments. Yet, shortly after giving a name and password to the Guest Network the following dialogue appeared:
"DHCP Beginning Address:
The DHCP range you have entered conflicts with the WAN IP address of your AirPort wireless device" (showing: "10.0.1.2") and
"DHCP Ending Address:
The DHCP range you have entered conflicts with the WAN IP address of your AirPort wireless device"
(showing: "10.0.1.200").
There was no actual apparent conflict of addresses while otherwise my wireless network was working fine until then. Since I could not figure out how to solve this issue, I chose to revert (button) the action.
Now, although my wireless network is working fine, the Guest Networking tab is gone for good from my AU as well as my settings for Guest Networking is non-existent.
After searching for solutions herein the community forum, I figured that my AE in NOT a Dual Band version capable of the Guest Network option which AU had first presented me with.
MY QUESTION NOW IS:
If I switch to a new wireless set up having my brand new TC acting as the main base connected to the simple modem (Ethernet), leaving it to "Share a Public IP Address", while using my older AE to "Extend a Wireless Network", will I be able to get the Guest Network tab back in AU (to set up via TC) a wireless Guest Network?
Thanks in advance for your help!

MY QUESTION NOW IS:
If I switch to a new wireless set up having my brand new TC acting as the main base connected to the simple modem (Ethernet), leaving it to "Share a Public IP Address", while using my older AE to "Extend a Wireless Network", will I be able to get the Guest Network tab back in AU (to set up via TC) a wireless Guest Network?
Yes. Your TC is a dual-band model, so you'll have the option of creating a guest network as long as your TC is set to "Share a Public IP" and "Create a wireless network."
EDIT: Note that you won't be able to wirelessly extend the guest network. You'll still be able to wirelessly extend the main network.

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    Message was edited by: wiswic

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