When the virtual adapter driver receives the DHCP Discover and DHCP Request packets, it responds to the DHCP Offer and DHCP ACK by using the VPN Tunnel Server IP ( 10.200.200.200), which is provided by the VPN service.
For your reference: RFC 2131 and RFC 2132. Since the VPN service has already received the VPN tunneling parameters directly from the PCS appliance, the DORA process which happens on the client is initialized in compliance with the Dynamic IP assignment or DHCP standards defined in Requests for Comments (RFCs) published by the Internet Engineering Task Force (IETF). By default DHCP is enabled in the virtual adapter, so when the VPN service enables the virtual adapter, the TCP/IP stack initiates the DORA process.The VPN service on the client then enables the virtual adapter and passes the VPN tunneling parameters to the virtual adapter driver.The PCS will then pass down the VPN tunneling parameters (IP address, subnet mask, DNS \ WINS Servers, and VPN Tunnel Server IP address) to the VPN service on the client.Note: If a DHCP server has been setup with IP address scopes which are different from the PCS’s internal IP subnet, refer to KB22611 - Network Connect: Assign IP addresses from a DHCP scope not on the IVE internal interface subnet. If DHCP server is used, the PCS will begin initiating DORA (Discover, Offer, Request, and ACK) messages to the DHCP server on behalf of the VPN Tunneling client, as in this example: If IP address pool configuration is in use, then the PCS will automatically select an available IP address from the pool and assign it to the client.
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