1. Industry background and needs:

Although China has the second largest share of IPv4 addresses in the world, China has the largest number of Internet users in the world, and the number of Internet users is still rising. The IPv4 address resources have long been seriously scarce. At present, the major operators of the IPv4 public network address nearly dried up.

Faced with the problem of IPv4 address shortage, the current mainstream solutions focus on two directions: first, deploy CGN gateway in metropolitan area network; second, promote network evolution to IPv6 .IPv6 is the most direct way to solve the problem of IP address exhaustion. The most effective method, however, is that a large number of IPV4 application services and end-user upgrades are needed in the process of IPv6 promotion, so it is quite difficult to deploy IPv6 on a large scale in a short period of time. It also does not need to adjust the existing network and application, so it becomes a fast and effective way for telecom operators to solve the problem of IPv4 address depletion.

2, DPtech solution:

The operator CGN solution of Depp Technology Co., Ltd. is a concentrated embodiment of the strong R & D capability of Hangzhou DPtech Technology Co., Ltd., which can fully meet the requirements of telecom operation level in performance, reliability, networking and traceability. CGN solution has been widely used in the network of China Unicom, China Telecom, China Mobile, Radio and Television Network, China Railcom and so on.

Figure 1

In metropolitan area network, we can use centralized scheme to deploy CGN gateway of Depp technology, hang CGN gateway on CR router, and cross connect with two CR routers by double home mode. Ensure redundant network structure. For private network address user flow drainage problem in metropolitan area network, in addition to the traditional policy routing, DPtech has also creatively proposed a MPLS drainage method, and the original public network source address user traffic in the man will continue to be forwarded through three layers, independent of the impact of the new CGN gateway.

The retrofit and construction of traceability system can be divided into two modes. It can be upgraded on the original system or can be deployed in the new traceability system. The large capacity CGN gateway of DPtech Technology can achieve a good docking with the third party system. All kinds of NAT log output are supported, and the relevant log formats can be customized and developed in accordance with different users' technical specifications to meet various requirements for compatibility with existing systems. In addition to the traditional NAT log traceability mode, The CGN gateway device of Depp technology can also realize the collection and output of application layer information such as URL log through additional DPI service module. In order to realize the ability of accurate traceability, Depp technology not only has the complete and flexible ability of collecting and outputting traceability information, but also the software platform can provide users with independent traceability system and realize the collection of all kinds of data. Storage and query.

In summary, DPtech technology provides users with the leading performance of the large capacity CGN gateway equipment, and a rich traceability system, the perfect match between the two, to provide users with an ideal metropolitan area network large capacity CGN gateway solution.

3. Why would you choose DPtech?

High performance

The single equipment can support 400G NAT throughput and 500 million concurrent processing capacity, which can meet the network needs of the broadband users of Mans, and fully meet the needs of the rapid development of Internet services.

High reliability

DPtech CGN equipment has multiple redundant backup technologies, including: network redundant backup, unique VSM technology to implement device-level redundancy switching, cloud card technology to implement card level 11 N: 1 and other backup modes.

■Networking capacity

Supports high-density megabyte interfaces, various POS interfaces, supports QinQ, OSPFIS-ISMGP-ISISv6, policy routing, OSPFv3OSPFv3ISISv6 BGP4 / ICMPv6PNN LDMPv1 / V2v3PIM-SMIM-DMP-PIM-SSMMMSDP and other commonly used protocols. It is worth mentioning that DPtech has creatively proposed the use of MPLS VPN to realize the traction of private network source address traffic. And got a large-scale mature application, fully reflect the technology innovation ability of DPtech technology.

■NAT capability

DPtech CGN equipment has a large number of metropolitan area network, campus network of mature application experience, with good business support capability, including: support source NATT, NAT conversion; Nat (single IP support for unlimited session), conical NAT and other NAT traversal technologies, various application layer gateways (including H323/SIP/H248/RTSP/FTP et al.), random allocation of post-#en2# source ports and port block allocation mode are supported.

■Accurate tracing

CGN equipment supports output of corresponding NAT logs according to the specifications of different operators, and docking with traceability system through Syslog and other interfaces, and supports DPI service module, which can extract information of application layer such as URL QQ account number.

■Smooth handover of IPv6

Deep-Tech CGN devices are designed to take into account the evolution from network to IPv6, support dual stack capabilities, and support various IPv6 transition technologies such as DS-LiteLite LAFT6NAT6NAT6Smart6.