A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Improving DNS Service Availability by Using
Long TTLs
Author(s) : V. Pappas, et al.
Filename : draft-pappas-dnsop-long-ttl-01.txt
Pages : 22
Date : 2006-3-3
Due to the hierarchical tree structure of the Domain Name System
[RFC1034][RFC1035], losing all of the authoritative servers that
serve a zone can disrupt services to not only that zone but all of
its descendants. This problem is particularly severe if all the
authoritative servers of the root zone, or of a top level domain's
zone, fail. Although proper placement of secondary servers, as
discussed in [RFC2182], can be an effective means against isolated
failures, it is insufficient to protect the DNS service against a
distributed denial of service attack (DDoS). This document proposes
to mitigate the impact of DDoS attacks against top level DNS servers
by setting long TTL values for NS records and their associated A
records. Our proposed changes are purely operational and can be
deployed incrementally. Our analysis shows that this simple
operational tuning has a small impact on DNS performance but can
significantly reduce the impact felt by client resolvers as a result
of a successful DDoS attacks on the DNS service.
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