The Teleworker VPN Client feature sets the security appliance as a Cisco VPN hardware client. The Cisco VPN hardware client supports two operation modes: Client Mode or Network Extension Mode (NEM). The operation mode determines whether the inside hosts relative to the Cisco VPN hardware client are accessible from the corporate network over the VPN tunnel. Specifying the operation mode is mandatory before making a connection because the Cisco VPN hardware client does not have a default mode.
All modes of operation also optionally support split tunneling, which allows secure access to corporate resources through the VPN tunnel while also allowing Internet access through a connection to an Internet Service Provider (ISP) or another service—thereby eliminating the corporate network from the path for web access.