6to4 - Security Considerations

Security Considerations

According to RFC 3964, 6to4 routers and relays should ensure that:

  • either or both the source and destination addresses of any encapsulated packet is within the 6to4 IPv6 prefix 2002::/16,
  • if the source IPv6 address is a 6to4 IPv6 address, its corresponding 6to4 router IPv4 address matches the IPv4 source address in the IPv4 encapsulation header,
  • similarly, if the destination IPv6 address is a 6to4 IPv6 address, its corresponding 6to4 router IPv4 address matches the IPv4 destination address in the IPv4 encapsulation header,
  • any embedded 6to4 router IPv4 address is global unicast.

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