You can use one of the following techniques to enable traffic flow in the remote access VPN tunnel.
- Configure the sysopt connection permit-vpn command, which exempts traffic that matches the VPN connection from the access control policy. The default for this command is no sysopt connection permit-vpn, which means VPN traffic must also be allowed by the access control policy.
This is the more secure method to allow traffic in the VPN because external users cannot spoof IP addresses in the remote access VPN address pool. The downside is that the VPN traffic will not be inspected, which means that intrusion and file protection, URL filtering, or other advanced features will not be applied to the traffic. This also means that no connection events will be generated for the traffic, and thus statistical dashboards will not reflect VPN connections.
To configure this command, select the Bypass Access Control policy for decrypted traffic option in your RA VPN Configuration. See Create an RA VPN Configuration.
- Create access control rules to allow connections from the remote access VPN address pool. This method ensures that VPN traffic is inspected, and advanced services can be applied to the connections. The downside is that it opens the possibility for external users to spoof IP addresses and thus gain access to your internal network. See Configure the Firepower Threat Defense Access Control Policy.