Hello,
We've setup an Azure gateway connecting our OnPrem network to Azure.
Traffic from OnPrem to Azure is working just fine, not a single pingdrop, at least not that i've noticed.
However, if we try to ping an on-prem device from Azure, than most of the time, I receive a time-out. To get things flowing again, I can ping the gateway subnet (10.0.10.132) and then all of a sudden, everything is working again. After a period (seems random, but mostly within 10 minutes) of inactivity, things are broken again.
During the time that Azure->OnPrem traffic isn't possible, traffic from OnPrem to Azure is working fine.
I'll try to give a brief, but complete, oversight of the configuration:
OnPrem:
Firewall: Fortigate 60D
Subnet: 10.0.0.0/24
Azure:
Address Space: 10.0.10.0/24 (10.0.10.4 - 10.0.10.254)
Subnet-1: 10.0.10.0/25 (10.0.10.4 - 10.0.10.126)
Gateway: 10.0.10.128 /29 (10.0.10.132 - 10.0.10.134)
I've used this Fortigate Cookbook for configuring the tunnel. What I find strange is that the settings from this MS article do not match with the Fortigate article.
I hope to hear some suggestions! Thanks in advance!