A carrier-level network address translation (CGN) method and device
A network address translation, carrier-level technology, applied in the field of network address translation CGN methods and devices, can solve problems such as limited number and inability to meet network equipment and the like
Active Publication Date: 2020-12-04
NEW H3C TECH CO LTD
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Problems solved by technology
[0002] The public network IP address is an address that can be directly used for communication in the Internet, but its number is limited, and it has been unable to meet the increasing number of network devices.
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[0014] At present, there are already some devices integrating BRAS and CGN functions, and each device can be connected to multiple ISPs. In one solution, the CGN device assigns a public IP address to the user according to the preset NAT rules after the user goes online, and converts the source address of the traffic from the user to the public IP address. Take the public network IP address assigned to the user is provided by ISP1 as an example, and the outbound interface 1 is connected to ISP1, then the user's traffic is forwarded to ISP1 through outbound interface 1, and the return traffic is converted according to the source IP address of the traffic (converted to public IP address) is returned from outbound interface 1. When the outbound interface 1 fails, the user's traffic will still be translated using the assigned public IP address (that is, the address provided by ISP1), but will be forwarded from the outbound interface 2 according to the routing switch. In this way, ...
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The invention provides a service provider level network address conversion CGN method and device. The method comprise steps that each outcoming interface is configured with NAT rules, and each publicnetwork IP address configured according to the NAT rules corresponds to the outcoming interface of the NAT rules; the flow of a designated business sent by user equipment is received; when the flow isin an existing network address conversion NAT conversation, whether the outcoming interface corresponding to a public network IP address utilized by the NAT conversation is available is determined; if not, a present available outcoming interface is selected to establish a new NAT conversation according to the NAT rules, and the newly-established NAT conversation is utilized to carry out network address conversation for the flow. The method is advantaged in that according a state of the outcoming interface of the CGN equipment, the available outcoming interface can be reselected according to the NAT rules when the outcoming interface is in fault, and the backhaul flow can be guaranteed to correctly receive.
Description
technical field [0001] The present disclosure relates to the technical field of computer networks, in particular to an operator-level network address translation (CGN) method and device. Background technique [0002] The public network IP address is an address that can be directly used for communication in the Internet, but its number is limited, which cannot satisfy the increasing number of network devices. NAT (Network Address Translation) technology can solve this problem. A large number of network devices can be assigned private IP addresses in a LAN. When they need to communicate with the Internet, they need to convert the private IP addresses to a This process is called NAT. [0003] ISP (Internet Service Provider, Internet Service Provider) can provide public network IP address, but user equipment is often not directly connected to ISP, but needs broadband operator equipment as an intermediary, that is, BRAS (Broadband Remote Access Server, broadband access server),...
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IPC IPC(8): H04L29/12
Inventor 徐步正
Owner NEW H3C TECH CO LTD