Time Capsule Double NAT error

Hello,
I would really like some advice on double NAT and bridge mode before I respond to an error message on my mothers macbook/ TC settings. She recently had some extremely high uploads (approx 10GB that ate up all of her allowance) at times when she was not at her computer and so I reset her TC and changed the WEP password to something really obscure to try and prevent anyone from hacking in to her wifi network.
She has a basic set up: Cable modem connected directly to the Time capsule with no other airports connected to the network. She uses a standard 2010 13"Macbook to access the internet over wifi.
Twice in the last week (once before she noticed the massive uploads and today at about the same time as her internet service says she had a 150MB download that she did not have) she has received an error that says:
"Double NAT
This Airport wireless device has a private IP address on its Ethernet WAN port. It is connected to a device or network that is using Network Address Translation (NAT) to provide private IP addresses. You should change your Airport wireless device from using DCHP and NAT to bridge mode"
My question is - will following these instructions fix her download problems or make it worse?
Also, is there any other way I can prevent someone from hacking into her network.
All advice welcome
Thanks
Emma

Having a double NAT, indicates that TWO devices on your network are performing Network Address Translation, I am not a complete expert on this or anything but it's not that big an issue, you probably just need to turn off NAT on your Mom's modem.
But this definitely IS NOT causing her issue of using up all her Data allowance with her ISP. Having a double NAT just complicates the network and can cause problems with certain apps. But It will NOT increase data use.
You should use WPA2 as the type of network encryption.
You can use Mac Address Filtering as some kind of added protection.
You could have a Non Broadcast SSID but this again is really only trivial protection, WPA2 with a STRONG password is your best bet.
Hope this helps,
Anything else I can do just let me know,
PS you should check the DHCP client list or attached client list in Airport settings to see if someone else is using your Mom's bandwidth.
Regards,
John
Message was edited by: JohnAlanWoods - Forgot to include the word 'NOT'

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