A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the IPv6 Operations Working Group of the IETF.
Title : Security Considerations for 6to4
Author(s) : P. Savola
Filename : draft-ietf-v6ops-6to4-security-00.txt
Pages : 32
Date : 2003-10-8
The IPv6 interim mechanism 6to4 (RFC3056) uses automatic IPv6-over-
IPv4 tunneling to interconnect IPv6 networks. The architecture
includes 6to4 Routers and Relay Routers, which accept and decapsulate
IPv4 protocol-41 ('IPv6-in-IPv4') traffic from anywhere. There
aren't many constraints on the embedded IPv6 packets, or where IPv4
traffic will be automatically tunneled to. These could enable one to
go around access controls, and more likely, being able to perform
proxy Denial of Service attacks using 6to4 relays or routers as
reflectors. Anyone is also capable of spoofing traffic from non-6to4
addresses, as if it was coming from a relay, to a 6to4 node. This
document discusses these issues in more detail and tries to suggest
enhancements to alleviate the problems.
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