What's the best VPN solution for iPhone and Linux?

I want to able to access local network remotely with an iPhone. I have a centos server running 24/7 what's the best solution for that? I have installed pptpd on the server about a month ago. To this day, I have not been able to get it up and running. I am trying to find a new VPN solution for the linux server.
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Did you investigate about SSH?

Here is a great Guide on how to configure PPTPD on a Centos server.

You might also look at using OpenVPN.  It can be more secure that pptp.  There's an app for the iphone and ipad:  http://www.guizmovpn.com/  It does require your iphone to be jailbroken though so this may not be for everyone.
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gid01Author Commented:
Are there any solution that are more universal cross-platform? I need the VPN to run across linux, windows, macs, and iPhone (with no jailbreak)

Are there any open source IPSec server for centos???
If you need to stay with a stock iPhone (no jailbreak), pptpd is probably your best option.  Racoon is available as an IPSec server for CentOS, but it is much more complicated to configure and may have interoperability issues with the required authentication methods offered by the iPhone.

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I object to deleting this question.  Both myself and another person offered up pptpd as a vpn daemon.  Also Racoon IPSec server is another option.  If the questioner needs more clarification or detail, he should ask.
gid01Author Commented:
Sorry, I meant to close the other question.
I also object because I offered up pptpd and a howto solution to this question.
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