A tunnel server and client device

Abstract

The invention provides a tunnel server and a client device. The tunnel server processes a tunnel building request sent by a first monitor node, allocates a virtual internet protocol (IP) to the first monitor node, confirms an access request of a second monitor node sent by the first monitor node, locally builds a tunnel forwarding table item which corresponds to an access and comprises a real IP of the first monitor node, the virtual IP of the first monitor node, an IP of the second monitor node and an identification corresponding to the access, repeatedly packaging an IP head which is sent by the first monitor node and accesses a message of the second monitor node according to the tunnel forwarding table item corresponding to the access, and sending the packaged IP head to the second monitor node, wherein the packaged IP head comprises the first monitor node virtual IP serving as a source IP and the second monitor node IP serving as a purpose IP address. The tunnel server and the client device achieve flow control and network safety of front end equipment in a monitor network with network address translation (NAT).

Description

Technical field [0001] The invention relates to the field of video surveillance, and in particular to a tunnel server and a client device applied to a video surveillance network. Background technique [0002] With the continuous development of standardized and easily expandable IP network technology, video surveillance technology based on IP networks has also developed rapidly, and IP surveillance has become the mainstream of surveillance at present. Generally, users use NAT technology when designing an IP surveillance network according to their own security requirements. For example, some devices in the surveillance center, such as surveillance servers, IPSAN equipment, etc., are deployed on the NAT private network. The IP surveillance network with NAT can consider tunneling technology when realizing intercommunication. Some of the applicant's previous patent applications have recorded the implementation of this technology. However, when the tunnel technology realizes network i...

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