The NetScreen 25 is a high performance firewall and vpn appliance. It is designed for use in small and medium size offices. The NS 25 has four 10/100 Ethernet ports and offers 100 Mbps of firewall throughput. It can also serve as an IPSec VPN concentrator and supports 25 concurrent tunnels with 20 Mbps of 3DES encrypted data thoughput. NetScreen appliances run a custom operating system, the ScreenOS, on custom microprocessors for maximum security and performance. The NS 25 is rack mountable and occupies 1U of rack space. The package includes a standard US power cable and a rack mount kit. Please note that the current software version does not support the fourth 10/100 port. It may be enabled in future versions.