Some mobile operators are assigning 10.X.Y.Z IP addresses to mobile devices and use NAT to connect to the Internet. There are at least 3 problems caused by this approach:
1. No end-to-end connectivity is guaranteed. Some VPN services might fail.
2. NAT increases the battery drain due to some packets utilized to check the status of devices.
3. NAT can offer less than 65535 ports in use. If a mobile device is running P2P applications with about 100 ports open, then the total number of device that can be supported is 650 on a network segment.
IPv6 could solve all these problems. All mobile operators should assign IPv6 addresses to their customers.
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