Hi,
On my branch office I run a fortigate firewall. HQ runs Sophos UTM 9.6.
Branch office: dynamic ip, changes every 24hr
HQ: static IP
IPsec VPN is up and working fine until at the branch office there is a IP-change, what occours every 24hrs.
Then the tunnel is still up, but no traffic flows in any direction.
My understand is that the tunnel should go down immediatelly, when there is the ip-change, and re-established immediatelly.
But obviously this is not the case.
After two hours the traffic is flowing again.
If I manually put the tunnel down/up on the branch office then traffic flows again immediatelly.
So how can I troubleshoot this?
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