Orome1 writes: While many companies use IPsec for secure remote access to their networks, no integrated IPsec VPN client is available on Android. Apple has already fixed this shortcoming in iOS, in part, because it wanted make the iPhone attractive for businesses. The Android operating system doesn’t just lack an integrated IPsec VPN client, it also makes installing and configuring third-party VPN software quite complicated. IPsec VPN clients have to be integrated into the kernel of each device, and the client software has to be installed specifically for a memory area. This means that the firmware of each Android smartphone or tablet has to be modified accordingly. Until a “real” IPsec VPN client is available, Android users can use their devices’ integrated VPN clients based on PPTP or L2TP, which is deployed over IPsec. A “real” IPsec VPN connection, however, is more secure because it encrypts data prior to authentication.
As far as the laws of mathematics refer to reality, they are not
certain, and as far as they are certain, they do not refer to reality.
-- Albert Einstein