We have a VPN from the UK to Holland, we manage the UK side on a Cisco router, I don't know what they use in Holland.
Phase 1 and 2 work, but we can only initiate from the UK side. So we had a report from a Dutch user who couldn't access a server in the UK and he was right as he couldn't ping it. I got his IP and went onto the server and pinged back to him and the tunnel SA came up and I could eventually ping him and everything works. Then after some time it goes down again I guess due to inactivity.
Now I have continuous pings running to their subnets to keep things up.
What should I check and get Holland to check?