The ADTRAN NetVanta 2100 is a VPN/Security gateway providing all the necessary components required to secure an integrated VPN solution. NetVanta 2100 addresses the small office or corporate branch office. It provides key security and data management features such as IPSec VPN tunneling, stateful inspection firewall, built-in router, authenticated remote user access, and Network Address Translation. On a public infrastructure like the Internet, security is of the utmost importance. NetVanta 2100 protects the corporate network against attacks with a built-in firewall and provides data security through encryption, authentication and key exchange. Stateful inspection firewall protects an organization's network from common cyber attacks including TCP synflooding, IP spoofing, ICMP redirect, land attacks, ping-of-death, and IP reassembly problems. NetVanta 2100 also encrypts the data being sent out onto the network, using either the DES (Data Encryption Standard) or 3DES encryption algorithms. In addition, Internet Key Exchange (IKE) can be used for user authentication supporting public and private keys or digital certificates, assuring that the proper VPN tunnel is established and that the tunnel has not been redirected or compromised. NetVanta 2100 is an IPSec-compliant device that provides secure communication over potentially insecure network components. As a security gateway, the NetVanta 2100 can provide up to 10 private encryption tunnels with unrestricted number of users. With the use of Network Address Translation (NAT), it can hide IP addresses from the external world. In addition, the internal router allows multiple users to share a VPN connection and can also direct incoming IP traffic. A remote NetVanta 2100 can easily be configured and managed using a standard web browser. Unlike a software-implemented VPN solution, which depends on local CPU and memory performance to implement encryption, this standalone hardware platform off-loads the CPU intensive encryption process. The NetVanta 2100 offers guaranteed interoperability with ADTRAN's complete line of NetVanta 2000 Series of VPN/Security gateways.