I believeIPv6’s address quantity advantage is well known to everyone. The abundant address stock is the reason why IPv6 has been selected as the new generation network bearer protocol and gradually The fundamental driver for commercial deployment.
However, compared to IPv4, the IPv6 protocol not only has a nearly infinite number of addresses, but also is superior in terms of network security. This article will focus on introducing youthe security advantages of IPv6.
Traceability and attack prevention
The address space of IPv6 is huge. NAT technology, which is widely used by operators to save IPv6 public network addresses, will no longer be necessary. Point-to-point connections can be established directly between IPv6 terminals without address translation, so IPv6 addresses are very easy to trace.
IPv6 addresses are divided into a 64-bit network prefix and a 64-bit interface address. **Assuming that an attacker scans 1 million hosts per second, it will take about 500,000 years to traverse all host addresses within a 64-bit prefix. **64-bit host addresses make network scanning much more difficult and costly. increase, thereby further preventing attacks.
The 64-bit host address greatly increases the difficulty and cost of network scanning, thus further preventing attacks.
Support IPSec security encryption mechanism
The IPSec security function is integrated by default in the IPv6 protocol, and encryption and verification functions are implemented through the Extended Authentication Header (AH) and the Encapsulated Security Payload Header (ESP).
The AH protocol implements data integrity and data source identity authentication functions, and ESP adds security encryption functions based on the above functions. The IPv6 protocol integrated with IPSec truly achieves end-to-end security. The intermediate forwarding device only needs to forward the packets with IPSec extension headers normally without processing the IPSec extension headers, which greatly reduces the forwarding pressure.
Security enhancements to NDP and SEND
In the IPv6 protocol, the Neighbor Discovery Protocol (NDP) is used to replace the ARP and some ICMP control functions in the existing IPv4.
The NDP protocol implements functions such as link layer address and route discovery, address automatic configuration, etc. by exchanging ICMPv6 information messages and error messages between nodes, and enhances the robustness of communication by maintaining neighbor reachability status. The NDP protocol is independent of the transmission medium and can be expanded more easily.
The existing IPv6 protocol layer encryption and authentication mechanism can protect the NDP protocol. The Secure Neighbor Discovery Protocol (SEND) protocol of IPv6 is a security extension of NDP. The purpose of SEND is to provide a backup mechanism to protect NDP through another encryption method independent of IPSec, ensuring the security of transmission.
True source address verification system
The true source IPv6 address verification architecture (SAVA) is divided into three levels: access network (Access Network), intra-area (Intra-AS) and inter-area (Inter-AS) source address verification, starting from the host IP address, IP address prefix The three granularities of autonomous domain and autonomous domain constitute a multiple monitoring and defense system.
This system can not only effectively prevent source address spoofing attacks, but also implement billing and network management based on real source addresses by monitoring traffic.
IPv6 security risks still exist
Compared with IPv4, IPv6 is pre-designed and fully considered in terms of security, but there are still some security risks that are difficult to solve. As a network layer protocol, IPv6 itself cannot solve attacks caused by other functional layers (such as application layer vulnerabilities).
At the same time, IPv6 inherits some of the existing security risks of IPv4, and transition mechanisms such as the dual-stack configuration implemented between IPv4 and IPv6 may also introduce security risks. At the same time, IPv6 also has its own unique security vulnerabilities.
Since the IPv6 protocol provides a reliable address verification and traceability mechanism, it can promptly trace the source of the above attacks after they occur, thus achieving efficient information security management.
Having network security awareness is a prerequisite for ensuring network security. Therefore, it is necessary to establish a good security awareness when deploying IPv6. When deploying, make full use of the security features of IPv6 and set a reasonable security deployment strategy.
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Network security learning resource sharing:
Finally, I would like to share with you a complete set of network security learning materials that I have studied myself. I hope it will be helpful to friends who want to learn network security!
Getting Started with Zero Basics
For students who have never been exposed to network security, we have prepared a detailed learning and growth roadmap for you. It can be said to be the most scientific and systematic learning route. It will be no problem for everyone to follow this general direction.
1. Learning roadmap
There are a lot of things to learn about attack and defense. I have written down the specific things you need to learn in the road map above. If you can learn them all, you will have no problem taking on private work.
2. Video tutorial
Although there are many learning resources on the Internet, they are basically incomplete. This is a video tutorial on network security that I recorded myself. I have accompanying video explanations for every knowledge point in the roadmap above. [Click to receive the video tutorial]
I also compiled the technical documents myself, including my experience and technical points in participating in large-scale network security operations, CTF and digging SRC vulnerabilities. There are also more than 200 e-books[Click to receive it Technical Documentation]
(They are all packaged into one piece and cannot be expanded one by one. There are more than 300 episodes in total)
3. Technical documents and e-books
I also compiled the technical documents myself, including my experience and technical points in participating in large-scale network security operations, CTF and digging SRC vulnerabilities. There are also more than 200 e-books[Click to receive it Books]
4. Toolkit, interview questions and source code
"If you want to do your job well, you must first sharpen your tools." I have summarized dozens of the most popular hacking tools for everyone. The scope of coverage mainly focuses on information collection, Android hacking tools, automation tools, phishing, etc. Interested students should not miss it.
Finally, here are the interview questions about network security that I have compiled over the past few years. If you are looking for a job in network security, they will definitely help you a lot.
These questions are often encountered when interviewing Sangfor, Qi Anxin, Tencent or other major companies. If you have good questions or good insights, please share them.
Reference analysis: Sangfor official website, Qi’anxin official website, Freebuf, csdn, etc.
Content features: Clear organization and graphical representation to make it easier to understand.
Summary of content: Including intranet, operating system, protocol, penetration testing, security service, vulnerability, injection, XSS, CSRF, SSRF, file upload, file download, file inclusion, XXE, logical vulnerability, tools, SQLmap, NMAP, BP, MSF…
Due to limited space, only part of the information is displayed. You need to click the link below to obtain it
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