The ADTRAN NetVanta 2400 is a corporate host IPSec compliant gateway providing all the necessary components required to secure an integrated VPN solution. As a large host security gateway, the NetVanta 2400 provides several key security features such as IPSec VPN tunneling with DES or 3DES encryption, stateful inspection firewall, and IKE for user authentication supporting public/private keys or digital certificates. In addition, it also offers a DMZ port for public server access, a hardware encryption accelerator for faster encryption throughput and up to 1, 000 simultaneous VPN tunnels. On a public infrastructure like the Internet, security is of the utmost importance. The NetVanta 2400 protects the corporate network against attacks with a built-in firewall and provides data security through encryption, authentication and key exchange. The NetVanta 2400 employs a stateful inspection firewall that protects an organization's network from common cyber attacks including TCP syn-flooding, IP spoofing, ICMP redirect, land attacks, ping-of-death, and IP reassembly problems. The NetVanta 2400 also encrypts the data being sent out onto the network, using either the DES (Data Encryption Standard) or 3DES encryption algorithms. Data integrity is ensured using MD5 or SHA1 as it is transported across the public infrastructure. In addition, Internet Key Exchange (IKE) can be used for user authentication supporting public/private keys or digital certificates, assuring that the proper VPN tunnel is established and that the tunnel has not been redirected or compromised. NetVanta 2400 is an IPSec compliant device that supports both ESP and AH protocols and provides secure communication over potentially unsecure network components. As a security gateway, the NetVanta 2400 can support up to 1, 000 private encryption communication tunnels through the Internet from remote locations. The NetVanta 2400 can also hide IP addresses from the external world by performing Network Address Translation (NAT). Configuring a NetVanta 2400 can easily be managed using a standard web browser or by using the control pad and LCD on the front panel. NetVanta 2400 has built-in alert and logging mechanisms for messaging and mail services. This enables the unit to warn administrators about activities that are going on in the network by logging them into a SYSLOG server or sending an email to the administrator. The NetVanta 2400 offers guaranteed interoperability with ADTRAN's complete line of NetVanta 2000 Series of VPN/Security gateways: NetVanta 2050 for work-at-home telecommuters, NetVanta 2100 for small office connectivity, NetVanta 2300 for branch offices or as a midsize host, and the software implemented, NetVanta VPN Client. Together the NetVanta 2000 Series offers the most robust features and functions to address a wide range of enterprise VPN needs.