Subject: DDoS attack on IETF Website

From: IETF Secretariat <[email-masked]>
Date: Mon, 15 Oct 2018 10:40:16 -0700

Dear IETF Community,

Today, at approximately 14:00 UTC,  the IETF website began to experience a DDoS attack from a group of hosts in Asia.  This attack generated sufficient request volume to cause the IETF site, as well as the Datatracker and Mailarchive, to time out on some user requests.

The suspect traffic sources were identified and firewalled off through the CDN and on the local network, and normal service has resumed.

For a period of time, some users may see a brief interstitial screen from the CDN when requesting pages from the main IETF site.  This is expected behavior when the CDN is reforming traffic analysis to mitigate an attack.

If you have any questions, please submit them to [email-masked].

- IETF Secretariat