I-D ACTION:draft-savola-v6ops-6to4-security-01.txt

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	Title		: Security Considerations for 6to4
	Author(s)	: P. Savola
	Filename	: draft-savola-v6ops-6to4-security-01.txt
	Pages		: 27
	Date		: 2002-12-6
	
The IPv6 interim mechanism 6to4 [6TO4] uses automatic IPv6-over-IPv4
tunneling to interconnect IPv6 networks.  The architecture includes
Relay Routers and Routers, which accept and decapsulate 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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