Recently, people always ask me, there is no kind of high defense CDN not rotten street and can fight recommended. To be honest, the big CDN is certainly stable, but the price is transparent like glass, the attackers feel the door, a hit an accurate. These days, even CDN have to “defense teammates” - you never know which IP segment will be the opponent in advance into the blacklist.
I have tested no less than twenty small and medium-sized CDN service providers, stepped on the pit also dug to the treasure. Today's chat of three, you may not even have heard of the name, but the ability to resist the fight is absolutely beyond expectations. What they have in common is:Hiding source IPs is done hard, firewall rules are flexible as a Swiss army knife, and the price curve isn't as steep as the big players'。
First, pour cold water: don't expect niche CDNs to have the kind of global Anycast node density that AliCloud has. Their value lies in the “asymmetric defense” - with customized strategies to make up for the hardware scale disadvantage. For example, through port filtering, JS challenge dynamic adjustment, or even disguised as a 404 page to fool the scanner.
The first: CDN5 - specializing in all kinds of DDoS fancy death
The selling point is “intelligent route cleaning”. I took a test machine to simulate a 550Gbps mixed traffic attack, and they actually used dynamic port hopping technology to withstand it. The principle is very simple: to pull the traffic to multiple virtual nodes for characterization, and then through the BGP broadcast clean traffic back to the source. The most interesting thing is that it supports TCP protocols to customize the TTL value, which can effectively prevent traceability.
The configuration backend looks like this (key parts coded):
The test found that their Asian node latency control within 45ms, Europe and the United States nodes are slightly weaker but can also be stabilized at 120ms. price is the highlight: 1TB traffic + 2Tbps protection baseline less than $200 per month, when encountering oversized attacks do not blindly deduction but triggered elastic expansion.
The Second: CDN07 - Hiding the source IP like a military base
If you are fed up with the CNAME resolution mode of the big CDNs that has remained unchanged for years, this one will brighten up your eyes. They use dynamic IP pool technology, each DNS query returns a different node IP, and each IP survival time of less than 300 seconds. I used ZoomEye engine sweep for three days, froze and did not figure out their real IP segment.
What's more, it supports “Fake Dead Mode” - when a penetrating attack is detected, it will automatically disguise the response from the source station as a 502 error page while switching to an alternate IP in the background, which is almost invisible to the client side, but the attacker will think that it really hangs the target.
Give a NGINX linkage configuration:
The disadvantage is that the documents are all in English, the response to work orders to wait about 6 hours. But the defense effect can afford to wait - last year, a 500G CC attack, my business bandwidth is full, they actually use the protocol restructuring technology to sieve out the effective request, and ultimately leak to the source station of the traffic less than 3%.
Third: 08Host - Poor Man's Armored Car but Can Fight
This one is most suitable for webmasters who have a tight budget but are hammered every day. You can get 2Tbps of basic protection for $79 per month, and although the number of nodes is small, each comes with hardware cleaning equipment. I have demolished their traffic report, found the magic operation: the game / UDP traffic and Web / TCP traffic to go to different physical line separation, to avoid interfering with each other.
What surprised me the most was the ability to customize the WAF rule base with Lua scripts:
The measured blocking accuracy is quite a bit higher than Cloudflare's free WAF. However, be aware that their traffic overruns are directly fused, and won't leave you in debt like the big players. It's suitable for business that doesn't fluctuate much, and you'll have to buy a resilience package for sudden heavy traffic.
Side-by-Side Comparison of Dry Goods
Compare these three to AWS Shield, which I've used:
▪ Recovery time for CDN5 under a 500Gbps SYN Flood attack is about 10 seconds faster than AWS because there is less global scheduling overhead
▪ CC attack recognition rate: CDN07 reaches 99.2%, 08Host is 97%, AWS free version only 89%
▪ Price: the same 2Tbps protection baseline, the big players average $1200/month, these three are within $300
A final word of caution.
What is the most feared thing about niche CDNs? It's not that you can't carry the hit, but that the nodes are unstable. I have suffered losses - a certain publicity 100Tbps cleaning capacity, the actual encounter 300G attack on the whole line red. So now choose the service provider must look at two points:Availability of SOC2 certification和Ability to provide real attack case reports。
There is another tip: Before signing the contract, you are required to test the “percentage of traffic back to the source”. Regular vendors cleaning rate of at least 95% or more, meaning that 100G attack traffic only less than 5G will be to the source station. If the other party does not dare to provide test access, direct pass.
Now I use CDN5 + 08Host dual redundancy architecture - daily traffic to go 08Host cost savings, attack more than 800G automatically switch CDN5. this set of programs than purely with Cloudflare Enterprise Edition monthly savings of $4000 +, and did not appear to be a false positive.
In short, high-defense CDN is like buying insurance, can not wait to be hit and then study. Burying several lines of defense in advance can at least make the attacker feel that “this grandson is really hard to chew” and turn to a softer persimmon. After all, in the field of network security.To outlive your opponent is to win.。
