Dumb Newby Here: Turn off DHCP

Hello. In trying to set up my cloud, I click on "back to my mac" to enable that, and a bubble appears: More.
I click on that and the message says: "back to my mac may be slow because more than one device on your network is providing network services. Turn Off NAT and DHCP on one of hte devices and try again. See the documentation that came with the device for info about turning off network services"
WHICH two devices, and how do I tell? And which should be turned off?
I have one airport. (I got a time capsule, but not set it up yet...ten things at a time is all I am good for...)
Thanks if anyone can try to help.
Back tomorrow.

Well, what you describe is a straightforward modem, not a modem with a router, which makes the error message you are getting a mystery. You need to leave Airport set to share the connection if you have more than one device connected to it (by either ethernet or wifi). Whether the modem is passing your ISP-allocated IP number on to the Airport or allocating it's own may be the issue.
Open Airport Utility, click the 'Manual Setup' button, and you should open to the 'Summary' tab (if not, select it). The very bottom entry is 'IP' address. If this begins with 10, 172 or 192 then the modem is issuing the IP number; any other number is the one allocated to your connection by your ISP (you could connect just one machine to the modem in this case, and it would receive this number).
If the router is issuing a 10, 172 or 192 number this can be the cause of the problem, particularly if it's a 10 number - this range is used by Airport. You would need to speak to your ISP about this.
You can buy ADSL modems, but it depends on whether your ISP will raise objections, and you would need to make sure that you can get one which acts as a modem only.
However, all this arises from a 'Back to My Mac' error message, and it's possible this may not even be relevant. Is everything else working without any difficulty? In fact, does 'Back to my Mac' work OK? If so I should just forget about it.

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