A DNS zone is usually served by multiple authoritative servers, which is actually recommended for the sake of redundancy. Large authoritative DNS operators even combine different name server implementations to avoid complete infrastructure outage in case of any software error. For synchronizing zone contents between authoritative servers, a DNS-specific mechanism is available, called zone transfer. It is well established and supported by all common DNS implementations. It enables both full zone transfer (AXFR) and incremental update (IXFR).
Sentinel View report – June 2023
The total number incidents decreased by half. However, there are only slightly fewer than 10,000 distinct attackers on the greylist. The last month’s seemingly minor reduction may have been indicative of an ongoing decline.
