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NE40E V800R010C00 Feature Description - NAT and IPv6 Transition 01

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DS-Lite ALG

DS-Lite ALG

The DS-Lite application level gateway (ALG) translates IP addresses and port numbers for special application layer protocols. DS-Lite ALG is similar to NAT44 ALG. In the public process, in the forward (user-to-network) direction, the DS-Lite ALG processes IPv4 over IPv6 packets by removing IPv6 headers and processing information in the IPv4 packet and payload. In the reverse (network-to-user) direction, DS-Lite ALG processes information in the IPv4 packet and payload, adds an IPv6 header to the packet, and processes the IPv6 packet.

Packets of many application layer protocols contain user information, including IP addresses and port numbers. These protocol packets may fail to be forwarded because DS-Lite cannot identify the IP addresses and port numbers carried in these protocol packets. To address this problem, the DS-Lite ALG technique is introduced.

The DS-Lite ALG function supports various application layer protocols, such as Internet Control Message Protocol (ICMP), Session Initiation Protocol (SIP), Real-Time Streaming Protocol (RTSP), Point-to-Point Tunneling Protocol (PPTP), and File Transfer Protocol (FTP). After the DS-Lite ALG removes the IPv6 address from a forward packet, the DS-Lite ALG processes the packet in the same way as the NAT ALG does.

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Updated: 2018-07-04

Document ID: EDOC1100027155

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