The NAT (Network Address Translation) software from Aricent is a portable implementation of the IETF standard RFCs. The Aricent NAT software includes additional ALGs(Application Level Gateways) to support different TCP and UDP applications along with other protocols.

Network Address Translation (NAT) provides a mechanism for a privately addressed network to access registered networks, such as the Internet, without requiring a registered subnet address. This eliminates the need for host renumbering and allows the same IP address range to be used in multiple intranets.

With NAT, the privately addressed network (designated as ‘inside’) continues to use its existing private or obsolete addresses. These addresses are converted into legal addresses before packets are forwarded onto the registered network (designated as ‘outside’). The translation is fully compatible with standard routing functionality and features. NAT is required only on the router connecting the inside network to the outside domain.

Aricent NAT Features

• Performs the basic IP address translation from local IP address to global IP address.
• Supports NAPT (Network Address Port Translation) IP address Overloading, which is used to share the same global IP address for different local hosts. This conserves the global IP address space to large extent.
• Supports the following application gateways FTP, Telnet, TFTP, NFS, SMTP, ICMP, DNS, HTTP, NTP and IP Multicasting.
• Static NAT - It establishes a one-to-one permanent address mapping between the inside and registered IP addresses.
• Dynamic NAT and NAPT - It establishes a translation from a pool of inside addresses to a pool of registered IP addresses and vice versa. This mapping remains until the corresponding application session closes.
• Proprietary MIB: NAT is completely configurable using this MIB.
• Dynamic removal of NAT entries from NAT table.
• It has features to completely inter operate with Aricent Firewall.
• Seamless integration through APIs with Aricent IP/RIP and Aricent SNMP.
• Conforms to Aricent Architecture for Portability Release 2.0.0.0 (FSAP2), thus ensuring a highly portable code which uses flexible buffer and timer management libraries

Aricent NAT reduces the time to market for OEMs and VARs who wish to incorporate the NAT functionality into their switching/routing devices.

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