In our previous post on using eXpress Data Path (XDP) for DNS, we discussed how a new XDP rate-limiting queries feature can augment a DNS service running in user space (with common DNS software) to deal with denial of service (DoS) attacks. Read: Journeying into XDP: Part 0 Read: Journeying into XDP: Augmenting the DNS Doing this rate-limiting at the earliest stage (just after the query arrives) makes a lot of sense, even when the DNS service in user space has the feature too because it saves th...