Linode 這陣子一直被 DDoS 攻擊，前幾天放出報告：「The Twelve Days of Crisis – A Retrospective on Linode’s Holiday DDoS Attacks」。
其中這段提到了一些數字，Linode 有個小機房有 40Gbps 的能力，但以現在的 DDoS 規模會馬上爆掉：
Linode’s capacity management strategy for IP transit has been simple: when our peak daily utilization starts approaching 50% of our overall capacity, then it’s time to get more links.
This strategy is standard for carrier networks, but we now understand that it is inadequate for content networks like ours. To put some real numbers on this, our smaller datacenter networks have a total IP transit capacity of 40Gbps. This may seem like a lot of capacity to many of you, but in the context of an 80Gbps DDoS that can’t be blackholed, having only 20Gbps worth of headroom leaves us with crippling packet loss for the duration of the attack.
另外把 DNS 整個放上 CloudFlare 讓他們來擋：
Our nameservers are now protected by Cloudflare, and our websites are now protected by powerful commercial traffic scrubbing appliances.
後續的改善應該還要幾個月？完成後應該會再看到 blog post...