[rfc-dist] RFC 3964 on Security Considerations for 6to4

rfc-editor at rfc-editor.org rfc-editor at rfc-editor.org
Fri Dec 3 13:29:46 PST 2004

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        RFC 3964

        Title:      Security Considerations for 6to4
        Author(s):  P. Savola, C. Patel
        Status:     Informational
        Date:       December 2004
        Mailbox:    psavola at funet.fi, chirayu at chirayu.org
        Pages:      41
        Characters: 83360
        Updates/Obsoletes/SeeAlso:    None

        I-D Tag:    draft-ietf-v6ops-6to4-security-04.txt

        URL:        ftp://ftp.rfc-editor.org/in-notes/rfc3964.txt

The IPv6 interim mechanism 6to4 (RFC3056) uses automatic
IPv6-over-IPv4 tunneling to interconnect IPv6 networks.  The
architecture includes 6to4 routers and 6to4 relay routers, which
accept and decapsulate IPv4 protocol-41 ("IPv6-in-IPv4") traffic
from any node in the IPv4 internet.  This characteristic enables a
number of security threats, mainly Denial of Service.  It also makes
it easier for nodes to spoof IPv6 addresses.  This document discusses
these issues in more detail and suggests enhancements to alleviate the

This document is a product of the IPv6 Operations Working Group of the

This memo provides information for the Internet community.  It does
not specify an Internet standard of any kind.  Distribution of this
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Joyce K. Reynolds and Sandy Ginoza
USC/Information Sciences Institute


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