I had setup site to site VPN. Two sites. The FortiOS version is 6.x on
both sites. Lets call the sites site 1 and site 2. There are modems at
both sites, connected to the WAN port of Fortigate unit. On site 1,
Fortigate unit was configured to use PPP...
Sorry for the late reply. Toshi Esumi's answer did not help. On site 2,
in policy, there is no VPN interface in incoming/outgoing interface. Any
suggestions?