Method and device for converting and forwarding network addresses

Abstract

The invention discloses a forwarding method and device for Network Address Translation (NAT). The device includes the following modules: a forwarding table for storing uplink forwarding rules or downlink forwarding rules, wherein, the uplink forwarding rules contain NAT rules and service transmission channels information; a receiving and matching module for receiving an uplink data packet or downlink data packet, and for matching a corresponding uplink forwarding rule or downlink forwarding rule according to the five-tuple information within the uplink data packet or downlink data packet; and a forwarding and processing module for processing the uplink data packet according to the uplink forwarding rule and transmitting the processed uplink data packet to a corresponding service transmission channel if the uplink data packet matches with the corresponding uplink forwarding rule, and for processing the downlink data packet according to the downlink forwarding rule and transmitting the downlink data packet processed to a corresponding port if the downlink data packet matches with the corresponding downlink forwarding rule. The invention can realize the network address translation, and meanwhile improve the forwarding efficiency.

Description

technical field [0001] The present invention relates to the communication field, in particular to a network address translation and forwarding method and device. Background technique [0002] With the development of the network, the IP network has become an indispensable tool in people's daily life. The scale of the network is constantly expanding, and the number of network users is increasing. However, due to historical reasons and the limitations of IPV4 network addresses, public network Address resources are very limited. At present, NAT (Network Address Translation, Network Address Translation) technology is the main method to solve this problem. Simply put, NAT technology is to use the internal address in the internal network of the LAN, and when the internal node wants to communicate with the external network, the internal address is converted into a public network address on the gateway, so that it can be used normally on the external network, NAT The technology can...

AI Technical Summary

Problems solved by technology

The biggest advantage of the hardware method is speed. Using hardware to implement NAT forwarding is more efficient, but the cost is relatively high, and the interface customization is not flexible. It is generally used in high-end equipment

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