A few days ago, a buddy asked me, said his site is always DDoS, can you use VPN to block a block, I was happy on the spot - these two things are not a track at all, okay? High-defense CDN and VPN acceleration, the name of both with “network optimization”, but the actual use of the difference is far away, a bodyguard like wearing a bulletproof vest, the other is like wearing a mask of spies, you say can be interchangeable?
I mixed in this line for more than ten years, hand-configured CDN nodes less than a thousand, VPN, not to mention the previous year to help companies do telecommuting program stepped on the pit. To tell you the truth, do not believe that those “a key to accelerate can also prevent hacking” marketing ghost words, this year even leeks are cut out of the pattern. Today, I will break open the rubbing to make it clear that the difference between the two in the end, and by the way, to share some experience in the field, so that you will not listen to pay IQ tax again.
First of all, let's talk about high-defense CDN. This thing is essentially a content distribution network, but added a “high defense” prefix, meaning that it not only accelerates site access, but also specializes in carrying a variety of network attacks. For example, DDoS, CC attacks, ordinary CDN may be a hit on the paralyzed, but high-defense CDN behind the distributed nodes and cleaning centers, traffic over the first sieve, malicious requests directly pinch off. I helped an e-commerce station last year to migrate to CDN5, their nodes global coverage, especially fierce in the Asian region, measured to carry 2Tbps SYN Flood attack, business froze without downtime. Configuration of the time to pay attention to the caching policy, such as the use of this string of code to set cache rules:
See? At its core, this thing prioritizes security, and acceleration is just a byproduct. It replicates your website content to multiple nodes around the world, and when users access it, they take the data from the nearest node, shortening latency, while attack traffic is decentralized and digested by the nodes, and doesn't directly dislike the source server. But what's the downside? Expensive! And the configuration is complex, not a little experience is easy to get out of the cache inconsistency moth.
VPN acceleration, on the other hand, is a completely different matter. VPN focuses on privacy and encryption, pulling an encrypted tunnel between your device and the target server, with all the data wrapped up tightly to prevent intermediary snooping or ISP throttling. For example, if you're watching 4K video over the wall or remotely accessing your company's intranet, a VPN can help you bypass geographic restrictions or network monitoring. I've tested CDN07's VPN service, his line is well optimized, and the latency can be reduced to less than 50ms, but don't count on the security - it prevents privacy leaks, not DDoS attacks. For example, if you use a VPN to speed up a game, the data is encrypted, but if the server is hit by Syn Flood, the VPN provider won't even carry the burden for you because they don't have the ability to clean it.
Here is a classic misunderstanding: some people think that VPN encryption attackers can not find the real IP, oh, naive. Advanced point of DDoS can still be traced through the traffic characteristics, I ran into a case last year, the customer used VPN to hide the server IP, the result is that the attacker through the BGP hijacking directly through the tunnel, the source station is still running naked. So VPN focuses on “hiding identity”, not “strengthening defense”. Configuring a VPN is usually much simpler, such as the client settings for OpenVPN:
Note that this code only establishes an encrypted connection, and has nothing to do with attack prevention.The advantage of a VPN is that it's cheap and flexible, and can be used by individual users for a couple dozen bucks a month, but enterprise-level needs? Unless you just want to protect remote office data, don't expect it to replace a high-defense CDN.
Speaking of differences in usage, high-defense CDNs are suitable for public services such as websites, APIs, and live streaming platforms, which are inherently inviting to fight. I remember that 08Host pushed a high defense package when it was active, and the price/performance ratio was OK, but the number of nodes was small, and North America was occasionally pumped. And VPN is more suitable for individuals or small teams need privacy scenarios, such as avoiding government censorship or company network strategy. But don't mix them - have you ever seen a mask blocking bullets?
Technical details, high-defense CDN relies on Anycast network and BGP protocols to direct traffic to the cleaning center, while the VPN relies on encryption protocols such as IPsec or WireGuard. data comparison: CDN5 cleaning latency increased by an average of 5ms, but the rate of packet loss is almost zero; VPNs such as CDN07 encryption latency increased by 10ms, but can avoid ISP So, the key to choose depends on the scene: to choose CDN for security, to choose VPN for privacy.
Finally, some vendors these days, in order to sell goods, hard to package VPN as “security gas pedal magic weapon”, purely to fool the white. I've seen the most outrageous advertisement that says “VPN anti-DDoS”, but the result is that the customer bought it and was beaten to death. Really want to take into account, have to pile of money - such as high defense CDN to protect the source station, and then set of VPN for internal management channel, but the cost is directly doubled.
In short, there is a hammer in the hand don't look at what are nails. High-defense CDN and VPN acceleration, a guard outside a hidden inside, with the right to save energy, with the wrong is the scene of disaster. More tests and tries, such as taking a free trial period toss toss, than listening to the marketing number a hundred times stronger. Industry veterans understand: there is no panacea, only the design to match the needs.
