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An access system and access method technology, applied in the field of external network access systems, can solve the problems of cumbersome, complex weight setting, complex expansion of NAT device clusters, etc., and achieve the effect of cost saving and traffic balance
Active Publication Date: 2013-03-13
BEIJING QIHOO TECH CO LTD
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Specifically, because the traffic of a specific VIP can only be forwarded to one NAT device within a certain period of time, the traffic processing capability of a single NAT device is certain. If the traffic corresponding to the VIP is large, the traffic of the NAT device Processing power will become a performance bottleneck
[0012] 2) Secondly, the expansion of the NAT device cluster is more complicated
However, if another NAT device D is added, the weight setting of each service on the NAT device D will be very complicated and cumbersome
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Embodiment 1
[0090] In order to realize the external network access function provided by the embodiment of the present invention, this example specifically provides a specific processing manner. In this example, the focus is on the application of the OSPF protocol, which is the basis of the embodiment of the present invention. see image 3 , the application of the OSPF protocol includes two parts: the first part is to run the OSPF protocol on the network equipment coupled with the intranet, and the second part is to run the OSPF protocol on the NAT device.
[0091] The implementation means of running the OSPF protocol on the NAT device will now be described in detail. An optional means of implementation is:
[0092] Use the zebra and ospfd components in the open source tool quagga to support the OSPF protocol, where zebra is responsible for updating the local routing table, and ospfd is responsible for the implementation of the ospf protocol and communicates with other devices running os...
Embodiment 2
[0100] Now take three NAT devices (NAT device A, NAT device B, and NAT device C) as an example to provide external network access services, and use these three NAT devices to undertake three services (service 1, service 2, and service 3). The total traffic is 360, assuming that the predefined traffic distribution method is equal distribution. then in this example,
[0101] The weight set by service 1 is NAT device A->120, NAT device B->120, and NAT device C->120;
[0102] The weight set by service 2 is NAT device B->120, NAT device A->120, and NAT device C->120;
[0103] The weight set for service 3 is NAT device C->120, NAT device B->120, and NAT device A->120.
[0104] In this way, under normal working conditions, the traffic of the three services respectively falls on the three NAT devices on average. However, if another NAT device D is added, the weight setting of each service on the NAT device D becomes:
[0105] The weight set by service 1 is NAT device A->90, NAT de...
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Abstract
The invention discloses an outer net access system, which comprises a first network device layer coupling an intranet, a plurality of NAT (network address translation) devices, and a second network device layer coupling an outer net, and each network device layer comprises at least one layer of network devices, wherein one end of the first network device layer is respectively coupled to a plurality of NAT devices, and the other end is coupled to an intranet server, to calculate the flow of an access request sent by the intranet server, and allocate the flow to each NAT device according to a predetermined allocation condition using OSPF (open shortest path first) protocol; ach NAT device in the plurality of NAT devices is coupled to the first network device layer, and the other end is coupled to the second network device layer, and the NAT device is configured to receive the flow according to the OSPF protocol, and forward the flow to the second network device layer; and the second network device layer is configured to receive the flow and access the outer net using the access request carried in the flow. By adopting the outer net access system, the operation and maintenance cost can be reduced. The invention also discloses a corresponding method.
Description
technical field [0001] The invention relates to the field of network applications, in particular to an extranet access method and an extranet access system. Background technique [0002] NAT (Network Address Translation, Network Address Translation) server, as a network access device, is responsible for providing access to the Internet (Internet) for machines on private network segments, and must have high availability. [0003] Currently, high availability is implemented through the VRRP (Virtual Router Redundancy Protocol, Virtual Router Redundancy Protocol) heartbeat protocol. The purpose of VRRP protocol design is to solve the problem of single point of failure caused by static routing. The core of VRRP is a selection protocol, which can dynamically assign the responsibility of a virtual router to one of the VRRP routers on the LAN. The VRRP router that controls the virtual router IP (Internet Protocol, Internet Protocol) addresses is called the main router, and it is ...
Claims
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