Address translation method and address translation device

Abstract

The invention discloses an address translation method, which comprises the following steps: performing data link layer processing on a message sent by an intranet device, and recording a source MAC (media access control) address of the message; matching an address translation table according to the quintuple of the message and the source MAC address of the recorded message; translating the source IP (internet protocol) address and the source port number of the message into a corresponding IP address and port number in a matched table entry, and sending out the converted message from a routed port if matching is successful; establishing a new address translation table entry in the address translation table if the matching fails, wherein the new address translation table entry comprises the quintuple information, the source MAC address and the new acquired IP address and the port number of the message; translating the source IP address and the source port number of the message into the new acquired IP address and port number. According to the address translation method disclosed by the invention, by adding a routing device with an improved NAT (network address translator) function, the goal that devices which are the same in intranet address in all intranets are accessed to the same extranet is achieved.

Description

technical field [0001] The invention relates to the field of data communication, in particular to an address conversion method and device. Background technique [0002] With the popularity of the monitoring industry, postal services or bank outlets will deploy monitoring systems. Such outlets are usually built using IPC and NVR to build their own monitoring system, please refer to figure 1 . During the early construction process, each network only needs to realize the local monitoring requirements. This requirement makes the zero-configuration NVR the first choice, that is, users only need to connect the NVR and IPC to the same Layer 2 switch. The zero-configuration NVR provides DHCP service, and the IPC uses DHCP to obtain an IP address and automatically registers to the NVR. The monitoring client only needs to log in to the default IP address of the NVR to perform monitoring operations. [0003] However, with the increasing importance of monitoring, the post office, b...

AI Technical Summary

Problems solved by technology

If each network point adds a routing device with NAT function, the cost will be relatively high, and each routing device also needs to carry out address planning and configuration management, and the workload is relatively large.

Images