Site-to-site VPN from Ubuntu server to Cisco ASA Firewall
My client is using an Ubuntu server and was wanting to create an IPSec VPN tunnel between that server and my Cisco ASA firewall. How would I accomplish this?
While I'm unable to verify this setup, it appears that this guide should begin to push you in the right direction. As a bit of caution, this isn't a Linode website so I'd exercise caution when clicking links on the page.
Based on that information, there is a quite a bit that goes into creating that link between the two and some of the configuration might be different depending on the version of Ubuntu that you're using although it at least helps explain how the process works.