ID: Problems with Max-Forwards Processing (and Potential Solutions)

draft-lawrence-maxforward-problems-00

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Problems with Max-Forwards Processing (and Potential Solutions)

This document describes an attack against SIP networks where a small
number of legitimate, even authorized, SIP requests can stimulate
massive amounts of proxy-to-proxy traffic. The document analysis
ways to limit the impact of this kind of attack, and proposes changes
to the SIP protocol to help mitigate the risk. The document also
proposes ways to improve diagnosis of failures caused by the hop
limit being reached.

The purpose of this document is to stimulate discussion of the
identified problem and proposed solutions. Much of the proposed
solution language appears normative, but implementors should not
treat the current document as such.

Comments are solicited, and should be directed to the SIPPING working group list at ‘sipping@ietf.org’.