I have a desktop running Ubuntu 14. This server is connected to a 3rd party VPN service, subnet 10.186.1.0/24. I have an Asus router, and have enabled the VPN service on that router so that I can connect to my home network when out. That network is configured as 10.8.1.0/24. I have updated the firewall on the Ubuntu box to allow traffic in and out from the second VPN network on any interface.
When the VPN on the Ubuntu box is up (10.182.1.0/24), and I connect from a client on the second VPN, I am unable to connect to the Ubuntu box. Connections timeout, nothing in the ufw or syslog.
If I drop the VPN connection on the Ubuntu box, I am able to connect from the remote client without problem.
Any suggestions on where I could look for logging? I already enabled full logging for iptables and ufw, nothing shows when I attempt to make the connection. Perhaps the 10.182.1.0/24 VPN is preventing the routing of connections from the 10.8.1.0/24 client?
Any suggestions on places to look would be greatly appreciated.