Any private address that is not in use on your network, when configuring the VPN client, will automatically be added as a route to the MX routing table. Configuring MX for Client VPN To enable client VPN, choose Enabled from the Client VPN server drop-down menu on the Security & SD-WAN > Configure > Client VPN page. The following client VPN options can be configured: Hostname: This is the hostname of the MX that client VPN users will use to connect This hostname is a Dynamic DNS (DDNS) host record correlating to the public IP address of the MX For more information on managing the hostname, see Dynamic DNS (DDNS) Client VPN subnet: The subnet that will be used for client VPN connections This should be a private subnet that is not in use anywhere else in the network The MX will be the default gateway on this subnet and will route traffic to and from this subnet The MX utilizes LCP (Link Control Protocol) to assign IPs to clients, thus DHCP and Static Assignment are not supported https://documentation.meraki.com/MX/Client_VPN/Client_VPN_Overview
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