The Integrated Services Module (ISM) for Cisco VPN routers provides high-performance, hardware-assisted tunneling and encryption services suitable for virtual private network (VPN) remote access and site-to-site intranet and extranet applications. As an integral component of the Cisco VPN solution, the ISM provides platform scalability and security while working seamlessly with all services necessary for successful VPN deployments - security, quality of service (QoS), firewall and intrusion detection, service-level validation, and management. This integration, combined with ISM support for the broad set of WAN media and services offered by the Cisco router, ensures the smooth integration of VPN technology into any enterprise or service provider network.The high-performance acceleration of Cisco IP Security (IPSec) offered by the ISM provides privacy, integrity, and authenticity for VPN - crucial requirements for transmission of sensitive information over the Internet. The ISM supports up to 2000 Data Encryption Standard (DES) or Triple DES encrypted tunnels for remote access applications and supports up to full duplex DS-3 line rate (90 Mbps) for site-to-site VPNs. The ISM coprocessor architecture offloads these processor-intensive functions from the main route processor of Cisco 7100 series routers, minimizing impact on system resources, thus delivering increased tunneling and encryption scalability for the most demanding VPN deployments. In addition, ISM support for advanced IPSec system facilities, such as the Cisco Tunnel Endpoint Discovery (TED) protocol, allows customers to implement IPSec transparently into the network infrastructure without the need for time-consuming crypto map management and without affecting individual workstations or PCs. The ISM also supports Microsoft's Point-To-Point Tunneling Protocol (PPTP) and Microsoft Point-to-Point Encryption (MPPE), providing highly scalable remote access VPN capabilities to Microsoft Windows 95/98/NT systems. The ISM supports up to 2000 simultaneous PPTP/MPPE remote VPN users protected with strong, 128-bit RC-4 encryption. With support for IPSec or PPTP, the ISM provides flexible options in remote access deployment models, enabling enterprises to utilize software resident in Microsoft Windows 95/98/ NT or Cisco Secure VPN client software based on IPSec (or other qualified third-party IPSec clients).