Setting up the VPN on iPhone

Have you tried setting up VPN on your iPhone? Why would any one want to set up VPN on the iPhone? iPhone and VPN issues still linger, even after 2.0 software release. Read this post

(1) To access internal web pages of their company.

(2) To get exchange email for which a VPN connection is needed.

For me its getting email. I cannot get exchange email on my iPhone even though IMAP is enabled on our exchange servers, as it appears that I need to be either on the internal network or VPN into the corporate network. I did try to set up VPN on the iPhone and ended up on two Apple web pages that talk about how to set up VPN and what protocols are supported for the iPhone.

iPhone supports the following configurations of PPTP and L2TP/IPSec protocols for VPN (Virtual private networks):

* PPTP + MSCHAPv2

* L2TP/IPSec with SharedSecret + MSCHAPv2

Essentially the iPhone does not support many protocols that are used by many companies. To name a few, something like, Pure IPSEC, L2TP/IPSEC with kerberos authentication token and RSA-Securid auth token. I seriously doubt if Apple themselves use one of the above two inbuilt native protocols of the OS X to connect to their corporate network.

As of now there is no solution for people who use the Cisco VPN solution on their macs. Cisco needs to write a VPN client as soon as Apple comes with a development kit for 3rd party apps on the the iPhone. If Apple and Cisco can work together on the iPhone name, why not work together and develop a vpn client for the iPhone? Are there any show stoppers for getting this done?