Use Cisco router to connect VPN server(ubuntu-based)

[Chin Chang]

I have a VPN server, it is ubuntu 18 based. The smart phone can use VPN to connect my VPN server(ubuntu18).
Please refer the URL：
https://drive.google.com/file/d/1R9hlGA0RHRTDZQaCdR6JpchlzW-gcQ4q/view
It can work.

Thus, I have an idea. Can I use Cisco router to replace smart phone? I want to use Cisco router VPN(interface tunnel) to ubuntu18.
Example, the tunnel configuration carries PPP header, include username and password. Or other methods.
Thanks^__^

[Philip D'Ath · Accepted solution]

You can build a site to site IPSec VPN between the Cisco route (assuming it has the correct licence) to Ubuntu.  I recommend using StrongSwan on Ubuntu.

There are lots of articles about building site to site VPNs between Cisco and StrongSwan on the Internet.

[Chin Chang]

But my idea is similar with DMVPN, not site to site VPN.
The ubuntu VPN server is like a DMVPN hub, and smart phones are like DMVPN spoke.
Can StrongSwan do it?

[Philip D'Ath]

This sounds like an ordinary VPN server, so the awser is yes.

This is not like DMVPN as DMVPN has usually has a routed subnet behind each spoke.

[Chin Chang]

Ok. I will try it. Thanks for your answer!