It's possible. You can get the IP from request.env.remote_addr and see if it's in your list of approved IPs. Do not use request.client ( like this slice http://www.web2pyslices.com/slice/show/1485/authenticate-using-ip-address-using-a-custom-decorator ) as that will use the ip in a http_x_forwarded_for header if there is one and that's just too easy to spoof.
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