Troubleshooting Tip: Losing internet access after connecting to dialup IPsec VPN with split tunneling enabled

[amahdi]

Description	This article describes a possible cause for losing internet access after the user connects to a dial-up IPsec VPN configured with split tunneling enabled.
Scope	FortiOS.
Solution	Upon configuring dial-up settings and enabling split tunneling, the user has to select accessible networks: As shown in the above screenshot, the user can select all (0.0.0.0/0) as a member of the accessible network group configured under the VPN settings. So upon connecting to the VPN, the user will lose internet connectivity since there is no policy configured from the VPN tunnel to the wan interface as the user has enabled split tunneling to route only internal traffic through the tunnel. Solution : Double-check and confirm that only desired subnets are specified under the VPN-accessible network settings.