A New Internet-Draft is available from the on-line Internet-Drafts
directories.
Title : Improving DNS Service Availability by Using Long TTL Values
Author(s) : V. Pappas, et al.
Filename : draft-pappas-dnsop-long-ttl-03.txt
Pages : 14
Date : 2006-10-26
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
distributed denial of service attacks (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 the associated A
records. Our proposal involves only operational changes and can be
deployed incrementally.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-pappas-dnsop-long-ttl-03.txt
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